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Why I have the wrong result ?

Your result:4 abababaab Right result:3 Fail:double_substring("abababaab")

My result is 4 and I can count 4 "ab" in "abababaab" Why the right result is 3 ?

Created: Jan. 16, 2018, 3:37 p.m.
Updated: Jan. 17, 2018, 5:05 p.m.
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neozero