Some Compilers Allow A Check During Execution That Subscripts Do Not Exceed Array Dimensions.

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Some compilers allow a check during execution that
subscripts do not exceed array dimensions. This is a help,
but not sufficient. First, many programmers do not use such
compilers because "They're not efficient." (Presumably, this
means that it is vital to get the wrong answers quickly.)
-- Kernighan & Plauger
-- The Elements of Programming Style

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