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Amusements in Mathematics by Henry Ernest Dudeney

In the making or solving of double acrostics, has it ever occurred to you to consider the

variety and limitation of the pair of initial and final letters available for cross words? You

may have to find a word beginning with A and ending with B, or A and C, or A and D,

and so on. Some combinations are obviously impossible—such, for example, as those

with Q at the end. But let us assume that a good English word can be found for every

case. Then how many possible pairs of letters are available?

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