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Hailstone sequenceHalt and catch fireHamming numbersHandle a signalHappy numbersHarmonic seriesHarshad or Niven seriesHash from two arraysHash joinHashtron inferenceHaversine formulaHello worldHere documentHeronian trianglesHex dumpHex wordsHickerson series of almost integersHigher-order functionsHilbert curveHistory variablesHofstadter-Conway 10 000 sequenceHofstadter Figure-Figure sequencesHofstadter Q sequenceHolidays related to EasterHome primesHonaker primesHorizontal sundial calculationsHorner's rule for polynomial evaluationHorse racingHost introspectionHostnameHough transformHourglass puzzleHTTPHTTPSHuffman codingHumble numbersHunt the Wumpus