diff --git a/py/ga_optimized_random_generator.py b/py/ga_optimized_random_generator.py
index f1083ff..a9c000e 100644
--- a/py/ga_optimized_random_generator.py
+++ b/py/ga_optimized_random_generator.py
@@ -5,7 +5,7 @@
 class GAOptimizedRandomGenerator:
     """Generate even random sequences according to a predefined TL ration (Ralph, 2014)"""
 
-    def __init__(self, choices, trials=64, tl=1, pool_size=10, n=2):
+    def __init__(self, choices, trials=64, tl=1, pool_size=100, n=2):
         """
         Initialize the genetic algorithm optimizer for n-back sequences.
         :param choices:
@@ -25,13 +25,13 @@
         :return: a sequence of items in "list" format.
         """
         generation = 0
-        best_parent = self.__find_best_parents(1)
-        while self.fitness(best_parent) > 0.1 and generation < 10000:
+        best_parent = self.__find_best_parents(1)[0]
+        while self.fitness(best_parent) > 0.1 and generation < 100000:
             generation += 1
             self.pool = self.mutate()
             self.pool = self.crossover_all()
-            best_parent = self.__find_best_parents(1)
-            print(''.join(best_parent[0]), ' ', self.calculate_tl_ratio(best_parent, self.n))
+            best_parent = self.__find_best_parents(1)[0]
+            print(best_parent, ' ', self.calculate_tl_ratio(best_parent, self.n))
         return best_parent
 
     def __init_pool(self, pool_size):
@@ -43,7 +43,7 @@
         self.pool.clear()
         all_comb = it.combinations_with_replacement(self.choices, self.trials)
         sample = random.sample(list(all_comb), pool_size)
-        self.pool.extend(sample)
+        self.pool.extend(map(lambda sampi: ''.join(sampi), sample))
         return self.pool
 
     def __find_best_parents(self, count=1):
@@ -66,7 +66,7 @@
 
     def fitness(self, seq):
         """
-        Calculate overall fitness of a sequence (block of trials).
+        Calculate overall fitness of a sequence (block of trials). It's cost, so we try to minimize this cost.
         :param seq:
         :return:
         """
@@ -121,4 +121,4 @@
     s = generator.generate()
     tl_ratio = generator.calculate_tl_ratio(s, 2)
 
-    print('GA-Optimized Sequence: %s' % ''.join(list(s[0])), 'with tl_ratio=%f' % tl_ratio)
+    print('GA-Optimized Sequence: %s' % s, 'with tl_ratio=%f' % tl_ratio)