diff --git a/lib/one_brc/measurements_processor.ex b/lib/one_brc/measurements_processor.ex
index 08e9014..2714e51 100644
--- a/lib/one_brc/measurements_processor.ex
+++ b/lib/one_brc/measurements_processor.ex
@@ -30,6 +30,10 @@ defmodule OneBRC.MeasurementsProcessor do
       "6" -> OneBRC.MeasurementsProcessor.Version6.process(count)
       "7" -> OneBRC.MeasurementsProcessor.Version7.process(count)
       "8" -> OneBRC.MeasurementsProcessor.Version8.process(count)
+      "9" -> OneBRC.MeasurementsProcessor.Version9.process(count)
+      "10" -> OneBRC.MeasurementsProcessor.Version10.process(count)
+      "11" -> OneBRC.MeasurementsProcessor.Version11.process(count)
+      "12" -> OneBRC.MeasurementsProcessor.Version12.process(count)
       _ -> raise "Unknown version"
     end
   end
diff --git a/lib/one_brc/versions/version_10.ex b/lib/one_brc/versions/version_10.ex
new file mode 100644
index 0000000..b209c6c
--- /dev/null
+++ b/lib/one_brc/versions/version_10.ex
@@ -0,0 +1,194 @@
+defmodule OneBRC.MeasurementsProcessor.Version10.Worker do
+  @compile inline: [
+             parse_weather_station: 3,
+             parse_temp: 2,
+             process_row: 2
+           ]
+  def run(parent_pid) do
+    send(parent_pid, {:give_work, self()})
+
+    receive do
+      {:do_work, chunk} ->
+        process_chunk(chunk)
+        run(parent_pid)
+
+      :result ->
+        send(parent_pid, {:result, :erlang.get()})
+    end
+  end
+
+  defp process_chunk(bin) do
+    process_chunk_lines(bin)
+  end
+
+  defp process_chunk_lines(<<>>) do
+    :ok
+  end
+
+  defp process_chunk_lines(bin) do
+    parse_weather_station(bin, bin, 0)
+  end
+
+  defp parse_weather_station(bin, <<";", _rest::binary>>, count) do
+    <<key::binary-size(count), ";", temp_bin::binary>> = bin
+    parse_temp(temp_bin, String.to_atom(key))
+  end
+
+  defp parse_weather_station(bin, <<_c, rest::binary>>, count) do
+    parse_weather_station(bin, rest, count + 1)
+  end
+
+  defp parse_weather_station(_bin, <<>>, _count) do
+    :ok
+  end
+
+  # ex: -4.5
+  defp parse_temp(<<?-, d1, ?., d2, "\n", rest::binary>>, key) do
+    temp = -(char_to_num(d1) * 10 + char_to_num(d2))
+    process_row(key, temp)
+    process_chunk_lines(rest)
+  end
+
+  # ex: 4.5
+  defp parse_temp(<<d1, ?., d2, "\n", rest::binary>>, key) do
+    temp = char_to_num(d1) * 10 + char_to_num(d2)
+    process_row(key, temp)
+    process_chunk_lines(rest)
+  end
+
+  # ex: -45.3
+  defp parse_temp(<<?-, d1, d2, ?., d3, "\n", rest::binary>>, key) do
+    temp = -(char_to_num(d1) * 100 + char_to_num(d2) * 10 + char_to_num(d3))
+    process_row(key, temp)
+    process_chunk_lines(rest)
+  end
+
+  # ex: 45.3
+  defp parse_temp(<<d1, d2, ?., d3, "\n", rest::binary>>, key) do
+    temp = char_to_num(d1) * 100 + char_to_num(d2) * 10 + char_to_num(d3)
+    process_row(key, temp)
+    process_chunk_lines(rest)
+  end
+
+  defp process_row(key, val) do
+    existing_record = :erlang.get(key)
+
+    case existing_record do
+      :undefined ->
+        :erlang.put(key, {1, val, val, val})
+
+      {count, sum, min, max} ->
+        :erlang.put(key, {count + 1, sum + val, min(min, val), max(max, val)})
+    end
+  end
+
+  defp char_to_num(c) do
+    c - ?0
+  end
+end
+
+defmodule OneBRC.MeasurementsProcessor.Version10 do
+  @moduledoc """
+  diff from version 9:
+  1. Inline parsing functions
+  """
+  import OneBRC.MeasurementsProcessor
+  alias OneBRC.MeasurementsProcessor.Version10.Worker
+
+  require Logger
+
+  def process(count) do
+    t1 = System.monotonic_time(:millisecond)
+    file_path = measurements_file(count)
+    worker_count = System.schedulers_online()
+    parent = self()
+
+    wpids =
+      Enum.map(1..worker_count, fn _ ->
+        spawn_link(fn ->
+          Worker.run(parent)
+        end)
+      end)
+
+    {:ok, file} = :prim_file.open(file_path, [:raw, :binary, :read])
+    :ok = read_and_process(file)
+    :prim_file.close(file)
+
+    results =
+      wpids
+      |> Enum.map(fn wpid ->
+        send(wpid, :result)
+
+        receive do
+          {:result, result} -> result
+        end
+      end)
+
+    t2 = System.monotonic_time(:millisecond)
+
+    result =
+      results
+      |> List.flatten()
+      |> Enum.reduce(%{}, fn {key, {count_1, sum_1, min_1, max_1}}, acc ->
+        case Map.fetch(acc, key) do
+          :error ->
+            Map.put(acc, key, {count_1, sum_1, min_1, max_1})
+
+          {:ok, {count_2, sum_2, min_2, max_2}} ->
+            Map.put(acc, key, {
+              count_1 + count_2,
+              sum_1 + sum_2,
+              min(min_1, min_2),
+              max(max_1, max_2)
+            })
+        end
+      end)
+      |> Enum.map(fn {key, {count, sum, min, max}} ->
+        {key, {min / 10.0, round_to_single_decimal(sum / count / 10.0), max / 10.0}}
+      end)
+      |> Enum.sort_by(fn {key, _} -> key end)
+
+    t3 = System.monotonic_time(:millisecond)
+
+    result_txt =
+      result
+      |> Enum.reduce("", fn {key, {min, mean, max}}, acc ->
+        acc <> "#{key};#{min};#{mean};#{max}\n"
+      end)
+
+    t4 = System.monotonic_time(:millisecond)
+
+    Logger.info("Processing data, stage 1 (processing) took: #{t2 - t1} ms")
+    Logger.info("Processing data, stage 2 (aggregating) took: #{t3 - t2} ms")
+    Logger.info("Processing data, stage 3 (sorting & txt creation) took: #{t4 - t3} ms")
+
+    result_txt
+  end
+
+  defp read_and_process(file) do
+    chunk_size = 1024 * 1024 * 1
+
+    case :prim_file.read(file, chunk_size) do
+      :eof ->
+        :ok
+
+      {:ok, data} ->
+        data =
+          case :prim_file.read_line(file) do
+            {:ok, line} -> <<data::binary, line::binary>>
+            :eof -> data
+          end
+
+        receive do
+          {:give_work, worker_pid} ->
+            send(worker_pid, {:do_work, data})
+        end
+
+        read_and_process(file)
+    end
+  end
+
+  defp round_to_single_decimal(number) do
+    round(number * 10) / 10.0
+  end
+end
diff --git a/lib/one_brc/versions/version_11.ex b/lib/one_brc/versions/version_11.ex
new file mode 100644
index 0000000..3733c05
--- /dev/null
+++ b/lib/one_brc/versions/version_11.ex
@@ -0,0 +1,192 @@
+defmodule OneBRC.MeasurementsProcessor.Version11.Worker do
+  @compile inline: [
+             parse_weather_station: 3,
+             parse_temp: 2,
+             parse_temp: 3,
+             process_row: 3
+           ]
+  def run(parent_pid) do
+    send(parent_pid, {:give_work, self()})
+
+    receive do
+      {:do_work, chunk} ->
+        process_chunk(chunk)
+        run(parent_pid)
+
+      :result ->
+        send(parent_pid, {:result, :erlang.get()})
+    end
+  end
+
+  defp process_chunk(bin) do
+    process_chunk_lines(bin)
+  end
+
+  defp process_chunk_lines(<<?\n, rest::binary>>) do
+    process_chunk_lines(rest)
+  end
+
+  defp process_chunk_lines(<<>>) do
+    :ok
+  end
+
+  defp process_chunk_lines(bin) do
+    parse_weather_station(bin, bin, 0)
+  end
+
+  defp parse_weather_station(bin, <<?;, _rest::binary>>, count) do
+    <<key::binary-size(count), _, temp_bin::binary>> = bin
+    parse_temp(temp_bin, String.to_atom(key))
+  end
+
+  defp parse_weather_station(bin, <<_c, rest::binary>>, count) do
+    parse_weather_station(bin, rest, count + 1)
+  end
+
+  defp parse_weather_station(_bin, <<>>, _count) do
+    :ok
+  end
+
+  # ex: 4.5
+  defp parse_temp(<<?-, rest::binary>>, key) do
+    parse_temp(rest, key, -1)
+  end
+
+  defp parse_temp(rest, key) do
+    parse_temp(rest, key, 1)
+  end
+
+  defp parse_temp(<<_::4, d1::4, ?., _::4, d2::4, rest::binary>>, key, mult) do
+    temp = mult * (d1 * 10 + d2)
+    existing_record = :erlang.get(key)
+    process_row(key, existing_record, temp)
+    process_chunk_lines(rest)
+  end
+
+  # ex: 45.3
+  defp parse_temp(<<_::4, d1::4, _::4, d2::4, ?., _::4, d3::4, rest::binary>>, key, mult) do
+    temp = mult * (d1 * 100 + d2 * 10 + d3)
+    existing_record = :erlang.get(key)
+    process_row(key, existing_record, temp)
+    process_chunk_lines(rest)
+  end
+
+  defp process_row(key, :undefined, val) do
+    :erlang.put(key, {1, val, val, val})
+  end
+
+  defp process_row(key, {count, sum, min, max}, val) do
+    :erlang.put(key, {count + 1, sum + val, min(min, val), max(max, val)})
+  end
+end
+
+defmodule OneBRC.MeasurementsProcessor.Version11 do
+  @moduledoc """
+  diff from version 10:
+  1. reduce function heads
+  2. refactor processing
+
+  Performance: Processes 10 million rows in approx 300ms
+  """
+  import OneBRC.MeasurementsProcessor
+  alias OneBRC.MeasurementsProcessor.Version11.Worker
+
+  require Logger
+
+  def process(count) do
+    t1 = System.monotonic_time(:millisecond)
+    file_path = measurements_file(count)
+    worker_count = System.schedulers_online()
+    parent = self()
+
+    wpids =
+      Enum.map(1..worker_count, fn _ ->
+        spawn_link(fn ->
+          Worker.run(parent)
+        end)
+      end)
+
+    {:ok, file} = :prim_file.open(file_path, [:raw, :binary, :read])
+    :ok = read_and_process(file)
+    :prim_file.close(file)
+
+    results =
+      wpids
+      |> Enum.map(fn wpid ->
+        send(wpid, :result)
+
+        receive do
+          {:result, result} -> result
+        end
+      end)
+
+    t2 = System.monotonic_time(:millisecond)
+
+    result =
+      for outer <- results, {key, {count_1, sum_1, min_1, max_1}} <- outer, reduce: %{} do
+        %{^key => {count_2, sum_2, min_2, max_2}} = acc ->
+          Map.put(acc, key, {
+            count_1 + count_2,
+            sum_1 + sum_2,
+            min(min_1, min_2),
+            max(max_1, max_2)
+          })
+
+        acc ->
+          Map.put(acc, key, {count_1, sum_1, min_1, max_1})
+      end
+      |> Enum.sort_by(fn {key, _} -> key end, :desc)
+
+    t3 = System.monotonic_time(:millisecond)
+
+    result_txt =
+      result
+      |> Enum.reduce([], fn {key, {count, sum, min, max}}, acc ->
+        [
+          Atom.to_string(key),
+          ?;,
+          Float.to_string(min / 10.0),
+          ?;,
+          Float.to_string(round_to_single_decimal(sum / count / 10.0)),
+          ?;,
+          Float.to_string(max / 10.0),
+          ?\n | acc
+        ]
+      end)
+
+    t4 = System.monotonic_time(:millisecond)
+
+    Logger.info("Processing data, stage 1 (processing) took: #{t2 - t1} ms")
+    Logger.info("Processing data, stage 2 (aggregating) took: #{t3 - t2} ms")
+    Logger.info("Processing data, stage 3 (sorting & txt creation) took: #{t4 - t3} ms")
+
+    result_txt
+  end
+
+  defp read_and_process(file) do
+    chunk_size = 1024 * 1024 * 1
+
+    case :prim_file.read(file, chunk_size) do
+      :eof ->
+        :ok
+
+      {:ok, data} ->
+        data =
+          case :prim_file.read_line(file) do
+            {:ok, line} -> <<data::binary, line::binary>>
+            :eof -> data
+          end
+
+        receive do
+          {:give_work, worker_pid} ->
+            send(worker_pid, {:do_work, data})
+        end
+
+        read_and_process(file)
+    end
+  end
+
+  defp round_to_single_decimal(number) do
+    round(number * 10) / 10.0
+  end
+end
diff --git a/lib/one_brc/versions/version_12.ex b/lib/one_brc/versions/version_12.ex
new file mode 100644
index 0000000..30f379e
--- /dev/null
+++ b/lib/one_brc/versions/version_12.ex
@@ -0,0 +1,192 @@
+defmodule OneBRC.MeasurementsProcessor.Version12.Worker do
+  @compile inline: [
+             parse_weather_station: 3,
+             parse_temp: 2,
+             parse_temp: 3,
+             process_row: 3
+           ]
+  def run(parent_pid) do
+    :erlang.system_flag(:backtrace_depth, 0)
+    send(parent_pid, {:give_work, self()})
+
+    receive do
+      {:do_work, chunk} ->
+        process_chunk(chunk)
+        run(parent_pid)
+
+      :result ->
+        send(parent_pid, {:result, :erlang.get()})
+    end
+  end
+
+  defp process_chunk(bin) do
+    process_chunk_lines(bin)
+  end
+
+  defp process_chunk_lines(<<?\n, rest::binary>>) do
+    process_chunk_lines(rest)
+  end
+
+  defp process_chunk_lines(<<>>) do
+    :ok
+  end
+
+  defp process_chunk_lines(bin) do
+    parse_weather_station(bin, bin, 0)
+  end
+
+  defp parse_weather_station(bin, <<?;, _rest::binary>>, count) do
+    <<key::binary-size(^count), _, temp_bin::binary>> = bin
+    parse_temp(temp_bin, String.to_atom(key))
+  end
+
+  defp parse_weather_station(bin, <<_c, rest::binary>>, count) do
+    parse_weather_station(bin, rest, count + 1)
+  end
+
+  defp parse_weather_station(_bin, <<>>, _count) do
+    :ok
+  end
+
+  # ex: 4.5
+  defp parse_temp(<<?-, rest::binary>>, key) do
+    parse_temp(rest, key, -1)
+  end
+
+  defp parse_temp(rest, key) do
+    parse_temp(rest, key, 1)
+  end
+
+  defp parse_temp(<<_::4, d1::4, ?., _::4, d2::4, rest::binary>>, key, mult) do
+    temp = mult * (d1 * 10 + d2)
+    existing_record = :erlang.get(key)
+    process_row(key, existing_record, temp)
+    process_chunk_lines(rest)
+  end
+
+  # ex: 45.3
+  defp parse_temp(<<_::4, d1::4, _::4, d2::4, ?., _::4, d3::4, rest::binary>>, key, mult) do
+    temp = mult * (d1 * 100 + d2 * 10 + d3)
+    existing_record = :erlang.get(key)
+    process_row(key, existing_record, temp)
+    process_chunk_lines(rest)
+  end
+
+  defp process_row(key, :undefined, val) do
+    :erlang.put(key, {1, val, val, val})
+  end
+
+  defp process_row(key, {count, sum, min, max}, val) do
+    :erlang.put(key, {count + 1, sum + val, min(min, val), max(max, val)})
+  end
+end
+
+defmodule OneBRC.MeasurementsProcessor.Version12 do
+  @moduledoc """
+  diff from version 11:
+  1. backtrace_depth set to 0
+
+  Performance: Processes 10 million rows in approx 300ms
+  """
+  import OneBRC.MeasurementsProcessor
+  alias OneBRC.MeasurementsProcessor.Version12.Worker
+
+  require Logger
+
+  def process(count) do
+    t1 = System.monotonic_time(:millisecond)
+    file_path = measurements_file(count)
+    worker_count = System.schedulers_online()
+    parent = self()
+
+    wpids =
+      Enum.map(1..worker_count, fn _ ->
+        spawn_link(fn ->
+          Worker.run(parent)
+        end)
+      end)
+
+    {:ok, file} = :prim_file.open(file_path, [:raw, :binary, :read])
+    :ok = read_and_process(file)
+    :prim_file.close(file)
+
+    results =
+      wpids
+      |> Enum.map(fn wpid ->
+        send(wpid, :result)
+
+        receive do
+          {:result, result} -> result
+        end
+      end)
+
+    t2 = System.monotonic_time(:millisecond)
+
+    result =
+      for outer <- results, {key, {count_1, sum_1, min_1, max_1}} <- outer, reduce: %{} do
+        %{^key => {count_2, sum_2, min_2, max_2}} = acc ->
+          Map.put(acc, key, {
+            count_1 + count_2,
+            sum_1 + sum_2,
+            min(min_1, min_2),
+            max(max_1, max_2)
+          })
+
+        acc ->
+          Map.put(acc, key, {count_1, sum_1, min_1, max_1})
+      end
+      |> Enum.sort_by(fn {key, _} -> key end, :desc)
+
+    t3 = System.monotonic_time(:millisecond)
+
+    result_txt =
+      result
+      |> Enum.reduce([], fn {key, {count, sum, min, max}}, acc ->
+        [
+          Atom.to_string(key),
+          ?;,
+          Float.to_string(min / 10.0),
+          ?;,
+          Float.to_string(round_to_single_decimal(sum / count / 10.0)),
+          ?;,
+          Float.to_string(max / 10.0),
+          ?\n | acc
+        ]
+      end)
+
+    t4 = System.monotonic_time(:millisecond)
+
+    Logger.info("Processing data, stage 1 (processing) took: #{t2 - t1} ms")
+    Logger.info("Processing data, stage 2 (aggregating) took: #{t3 - t2} ms")
+    Logger.info("Processing data, stage 3 (sorting & txt creation) took: #{t4 - t3} ms")
+
+    result_txt
+  end
+
+  defp read_and_process(file) do
+    chunk_size = 1024 * 1024 * 1
+
+    case :prim_file.read(file, chunk_size) do
+      :eof ->
+        :ok
+
+      {:ok, data} ->
+        data =
+          case :prim_file.read_line(file) do
+            {:ok, line} -> <<data::binary, line::binary>>
+            :eof -> data
+          end
+
+        receive do
+          {:give_work, worker_pid} ->
+            send(worker_pid, {:do_work, data})
+        end
+
+        read_and_process(file)
+    end
+  end
+
+  defp round_to_single_decimal(number) do
+    round(number * 10) / 10.0
+  end
+end
diff --git a/lib/one_brc/versions/version_9.ex b/lib/one_brc/versions/version_9.ex
new file mode 100644
index 0000000..d799513
--- /dev/null
+++ b/lib/one_brc/versions/version_9.ex
@@ -0,0 +1,189 @@
+defmodule OneBRC.MeasurementsProcessor.Version9.Worker do
+  def run(parent_pid) do
+    send(parent_pid, {:give_work, self()})
+
+    receive do
+      {:do_work, chunk} ->
+        process_chunk(chunk)
+        run(parent_pid)
+
+      :result ->
+        send(parent_pid, {:result, :erlang.get()})
+    end
+  end
+
+  defp process_chunk(bin) do
+    process_chunk_lines(bin)
+  end
+
+  defp process_chunk_lines(<<>>) do
+    :ok
+  end
+
+  defp process_chunk_lines(bin) do
+    parse_weather_station(bin, bin, 0)
+  end
+
+  defp parse_weather_station(bin, <<";", _rest::binary>>, count) do
+    <<key::binary-size(count), ";", temp_bin::binary>> = bin
+    parse_temp(temp_bin, String.to_atom(key))
+  end
+
+  defp parse_weather_station(bin, <<_c, rest::binary>>, count) do
+    parse_weather_station(bin, rest, count + 1)
+  end
+
+  defp parse_weather_station(_bin, <<>>, _count) do
+    :ok
+  end
+
+  # ex: -4.5
+  defp parse_temp(<<?-, d1, ?., d2, "\n", rest::binary>>, key) do
+    temp = -(char_to_num(d1) * 10 + char_to_num(d2))
+    process_row(key, temp)
+    process_chunk_lines(rest)
+  end
+
+  # ex: 4.5
+  defp parse_temp(<<d1, ?., d2, "\n", rest::binary>>, key) do
+    temp = char_to_num(d1) * 10 + char_to_num(d2)
+    process_row(key, temp)
+    process_chunk_lines(rest)
+  end
+
+  # ex: -45.3
+  defp parse_temp(<<?-, d1, d2, ?., d3, "\n", rest::binary>>, key) do
+    temp = -(char_to_num(d1) * 100 + char_to_num(d2) * 10 + char_to_num(d3))
+    process_row(key, temp)
+    process_chunk_lines(rest)
+  end
+
+  # ex: 45.3
+  defp parse_temp(<<d1, d2, ?., d3, "\n", rest::binary>>, key) do
+    temp = char_to_num(d1) * 100 + char_to_num(d2) * 10 + char_to_num(d3)
+    process_row(key, temp)
+    process_chunk_lines(rest)
+  end
+
+  defp process_row(key, val) do
+    existing_record = :erlang.get(key)
+
+    case existing_record do
+      :undefined ->
+        :erlang.put(key, {1, val, val, val})
+
+      {count, sum, min, max} ->
+        :erlang.put(key, {count + 1, sum + val, min(min, val), max(max, val)})
+    end
+  end
+
+  defp char_to_num(c) do
+    c - ?0
+  end
+end
+
+defmodule OneBRC.MeasurementsProcessor.Version9 do
+  @moduledoc """
+  diff from version 8:
+  1. Use String.to_atom for cities
+  """
+  import OneBRC.MeasurementsProcessor
+  alias OneBRC.MeasurementsProcessor.Version9.Worker
+
+  require Logger
+
+  def process(count) do
+    t1 = System.monotonic_time(:millisecond)
+    file_path = measurements_file(count)
+    worker_count = System.schedulers_online()
+    parent = self()
+
+    wpids =
+      Enum.map(1..worker_count, fn _ ->
+        spawn_link(fn ->
+          Worker.run(parent)
+        end)
+      end)
+
+    {:ok, file} = :prim_file.open(file_path, [:raw, :binary, :read])
+    :ok = read_and_process(file)
+    :prim_file.close(file)
+
+    results =
+      wpids
+      |> Enum.map(fn wpid ->
+        send(wpid, :result)
+
+        receive do
+          {:result, result} -> result
+        end
+      end)
+
+    t2 = System.monotonic_time(:millisecond)
+
+    result =
+      results
+      |> List.flatten()
+      |> Enum.reduce(%{}, fn {key, {count_1, sum_1, min_1, max_1}}, acc ->
+        case Map.fetch(acc, key) do
+          :error ->
+            Map.put(acc, key, {count_1, sum_1, min_1, max_1})
+
+          {:ok, {count_2, sum_2, min_2, max_2}} ->
+            Map.put(acc, key, {
+              count_1 + count_2,
+              sum_1 + sum_2,
+              min(min_1, min_2),
+              max(max_1, max_2)
+            })
+        end
+      end)
+      |> Enum.map(fn {key, {count, sum, min, max}} ->
+        {key, {min / 10.0, round_to_single_decimal(sum / count / 10.0), max / 10.0}}
+      end)
+      |> Enum.sort_by(fn {key, _} -> key end)
+
+    t3 = System.monotonic_time(:millisecond)
+
+    result_txt =
+      result
+      |> Enum.reduce("", fn {key, {min, mean, max}}, acc ->
+        acc <> "#{key};#{min};#{mean};#{max}\n"
+      end)
+
+    t4 = System.monotonic_time(:millisecond)
+
+    Logger.info("Processing data, stage 1 (processing) took: #{t2 - t1} ms")
+    Logger.info("Processing data, stage 2 (aggregating) took: #{t3 - t2} ms")
+    Logger.info("Processing data, stage 3 (sorting & txt creation) took: #{t4 - t3} ms")
+
+    result_txt
+  end
+
+  defp read_and_process(file) do
+    chunk_size = 1024 * 1024 * 1
+
+    case :prim_file.read(file, chunk_size) do
+      :eof ->
+        :ok
+
+      {:ok, data} ->
+        data =
+          case :prim_file.read_line(file) do
+            {:ok, line} -> <<data::binary, line::binary>>
+            :eof -> data
+          end
+
+        receive do
+          {:give_work, worker_pid} ->
+            send(worker_pid, {:do_work, data})
+        end
+
+        read_and_process(file)
+    end
+  end
+
+  defp round_to_single_decimal(number) do
+    round(number * 10) / 10.0
+  end
+end