diff --git a/.ruby-version b/.ruby-version
index bea438e..4772543 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.1
+3.3.2
diff --git a/client.log b/client.log
new file mode 100644
index 0000000..ab5aa56
--- /dev/null
+++ b/client.log
@@ -0,0 +1,24 @@
+https://localhost:9292/b?value=1
+https://localhost:9292/a?value=11
+https://localhost:9292/a?value=12
+https://localhost:9292/a?value=13
+https://localhost:9292/b?value=2
+https://localhost:9292/a?value=21
+https://localhost:9292/a?value=22
+https://localhost:9292/a?value=23
+https://localhost:9292/b?value=3
+https://localhost:9292/a?value=31
+https://localhost:9292/a?value=32
+https://localhost:9292/a?value=33
+AB1 = 6512bd43d9caa6e02c990b0a82652dca-c20ad4d76fe97759aa27a0c99bff6710-c51ce410c124a10e0db5e4b97fc2af39-6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
+https://localhost:9292/c?value=6512bd43d9caa6e02c990b0a82652dca-c20ad4d76fe97759aa27a0c99bff6710-c51ce410c124a10e0db5e4b97fc2af39-6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
+C1 = ee54918569d9620a4947a184c097ab1a90b33db6b8a009e01cbbe7238f800ecf846068a36ac7ae289a0796face8b471dcfd7e7d55f9081bccd8f2f50c1d4f888
+AB2 = 37693cfc748049e45d87b8c7d8b9aacd-3c59dc048e8850243be8079a5c74d079-b6d767d2f8ed5d21a44b0e5886680cb9-d4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35
+https://localhost:9292/c?value=37693cfc748049e45d87b8c7d8b9aacd-3c59dc048e8850243be8079a5c74d079-b6d767d2f8ed5d21a44b0e5886680cb9-d4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35
+C2 = 4bc5a33ec7c74626144b5277e887501074b07819ecd9cc506b08e765be1f26a3d7c9fbb59bde46379ca7f0ebf2ef066f38c0a4652d4017a635fc8bdddc070557
+AB3 = 182be0c5cdcd5072bb1864cdee4d3d6e-6364d3f0f495b6ab9dcf8d3b5c6e0b01-c16a5320fa475530d9583c34fd356ef5-4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce
+https://localhost:9292/c?value=182be0c5cdcd5072bb1864cdee4d3d6e-6364d3f0f495b6ab9dcf8d3b5c6e0b01-c16a5320fa475530d9583c34fd356ef5-4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce
+C3 = 35bf8dfb6c327259fd05a56a6d47ecfc21965b0f4ff8926b164c32e31cc91d825da1a73bc145cdec04dfbb0862fb14b687f15a8233be15092c4c85da4b7bf94a
+https://localhost:9292/a?value=35bf8dfb6c327259fd05a56a6d47ecfc21965b0f4ff8926b164c32e31cc91d825da1a73bc145cdec04dfbb0862fb14b687f15a8233be15092c4c85da4b7bf94a-4bc5a33ec7c74626144b5277e887501074b07819ecd9cc506b08e765be1f26a3d7c9fbb59bde46379ca7f0ebf2ef066f38c0a4652d4017a635fc8bdddc070557-ee54918569d9620a4947a184c097ab1a90b33db6b8a009e01cbbe7238f800ecf846068a36ac7ae289a0796face8b471dcfd7e7d55f9081bccd8f2f50c1d4f888
+FINISHED in 6.078406s.
+RESULT = 0bbe9ecf251ef4131dd43e1600742cfb
\ No newline at end of file
diff --git a/client.rb b/client.rb
index e001ba3..38d87e5 100644
--- a/client.rb
+++ b/client.rb
@@ -1,5 +1,8 @@
 require 'openssl'
 require 'faraday'
+require 'async'
+require 'async/semaphore'
+require 'async/barrier'
 
 OpenSSL::SSL::VERIFY_PEER = OpenSSL::SSL::VERIFY_NONE
 
@@ -38,41 +41,43 @@ def collect_sorted(arr)
 
 start = Time.now
 
-a11 = a(11)
-a12 = a(12)
-a13 = a(13)
-b1 = b(1)
+@a = Hash.new { |h, k| h[k] = [] }
+@b = {}
+@c = {}
 
-ab1 = "#{collect_sorted([a11, a12, a13])}-#{b1}"
-puts "AB1 = #{ab1}"
+Async do
+  semaphores = { a: 3, b: 2, c: 1 }.transform_values { |value| Async::Semaphore.new(value) }
+  barriers = Hash.new { |h, k| h[k] = Hash.new { |hh, kk| hh[kk] = Async::Barrier.new } }
 
-c1 = c(ab1)
-puts "C1 = #{c1}"
+  {1 => [11, 12, 13], 2 => [21, 22, 23], 3 => [31, 32, 33]}.each do |index, batch|
+    semaphores[:b].async(parent: barriers[:b][index]) do
+      @b[index] = b(index)
+    end
 
-a21 = a(21)
-a22 = a(22)
-a23 = a(23)
-b2 = b(2)
+    batch.each do |value|
+      semaphores[:a].async(parent: barriers[:a][index]) do
+        @a[index] << a(value)
+      end
+    end
+  end
 
-ab2 = "#{collect_sorted([a21, a22, a23])}-#{b2}"
-puts "AB2 = #{ab2}"
+  [1, 2, 3].each do |index|
+    semaphores[:c].async do
+      barriers[:a][index].wait
+      barriers[:b][index].wait
 
-c2 = c(ab2)
-puts "C2 = #{c2}"
+      ab_value = "#{collect_sorted(@a[index])}-#{@b[index]}"
 
-a31 = a(31)
-a32 = a(32)
-a33 = a(33)
-b3 = b(3)
+      puts "AB#{index} = #{ab_value}"
 
-ab3 = "#{collect_sorted([a31, a32, a33])}-#{b3}"
-puts "AB3 = #{ab3}"
+      @c[index] = c(ab_value)
 
-c3 = c(ab3)
-puts "C3 = #{c3}"
+      puts "C#{index} = #{@c[index]}"
+    end
+  end
+end
 
-c123 = collect_sorted([c1, c2, c3])
-result = a(c123)
+result = a(collect_sorted(@c.values))
 
 puts "FINISHED in #{Time.now - start}s."
 puts "RESULT = #{result}" # 0bbe9ecf251ef4131dd43e1600742cfb