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The listed groups of letters must be placed into boxes to form a chain of words, so that each box makes a word when paired up with the next box.
Often, more than one group of letters will fit into a particular box, but there are several strategically placed starters and the solver will need to make use of all of them.
The words on every other line of the grid read from right to left, as opposed to the usual left to right. This can make it trickier for solvers to identify words; for example, the word SIGNAL may appear in the grid as the letter combinations AL + SIGN.
Working with parts of words can be misleading: for example, the syllables RIC and HER have a different sound when combined to form RICHER.
In a simple variant of this puzzle, the letter groups are pre-placed. The objective is to pair up boxes, tracing a continuous chain of words from the start to the finish. Two boxes will typically be excluded from the chain. The letters in these boxes can be joined to form another word.