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CodingBat code practice

Java > Warmup-2 chance

Medium warmup string/array loops (solutions available)

 stringTimes H  frontTimes H  countXX H
 doubleX H  stringBits H  stringSplosion H
 last2 H  arrayCount9 H  arrayFront9 H
 array123 H  stringMatch H  stringX H
 altPairs H  stringYak H  array667 H
 noTriples H  has271 H

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