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find_counts_for_cohort('B')\n+  end\n+\n+  def able_to_find_cohort_counts?\n+    return true if @a_count != 0 && @b_count != 0\n+    false\n+  end\n+\n+  def calculate_average_conversion_rate\n+    @avg_rate_a = 0.0\n+    @avg_rate_b = 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