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Java > String-2 chance

Medium String problems -- 1 loop. See the Java String Help document for help with strings.

 doubleChar H  countHi H  catDog
 countCode endOther xyzThere
 bobThere xyBalance mixString
 repeatEnd repeatFront repeatSeparator
 prefixAgain xyzMiddle getSandwich
 sameStarChar oneTwo zipZap
 starOut plusOut wordEnds

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