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konstans@stuy.edu all > xyBalance
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We'll say that a String is xy-balanced if for all the 'x' chars in the string, there exists a 'y' char somewhere later in the string. So "xxy" is balanced, but "xyx" is not. One 'y' can balance multiple 'x's. Return true if the given string is xy-balanced.


xyBalance('y') → True
xyBalance('x') → False
xyBalance('') → True

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def xyBalance(str):

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