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Recursion-1 > countHi2
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Given a string, compute recursively the number of times lowercase "hi" appears in the string, however do not count "hi" that have an 'x' immedately before them.

countHi2("ahixhi") → 1
countHi2("ahibhi") → 2
countHi2("xhixhi") → 0

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public int countHi2(String str) { }

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