blockList = [ 'BO', 'XK', 'DQ', 'CP', 'NA', 'GT', 'RE', 'TG', 'QD', 'FS', 'JW', 'HU', 'VI', 'AN', 'OB', 'ER', 'FS', 'LY', 'PC', 'ZM' ]

canMakeWord = (word="") ->
    # Create a shallow clone of the master blockList
    blocks = blockList.slice 0
    # Check if blocks contains letter
    checkBlocks = (letter) ->
        # Loop through every remaining block
        for block, idx in blocks
            # If letter is in block, blocks.splice will return an array, which will evaluate as true
            return blocks.splice idx, 1 if letter.toUpperCase() in block
        false
    # Return true if there are no falsy values
    false not in (checkBlocks letter for letter in word)

# Expect true, true, false, true, false, true, true, true
for word in ["A", "BARK", "BOOK", "TREAT", "COMMON", "squad", "CONFUSE", "STORM"]
    console.log word + " -> " + canMakeWord(word)