The non-number bits of every string must be the same.
i The first pair of strings with different non-number bits are strings 1 and 3.
x They are 'abc9def55' and 'abc10xyz7'.
It should either be the case that all strings start with numbers or that none of them do.
x String number 1 '0abc9def55g' does start with a number whereas string number 2 'abc10def7g0' does not start with a number.
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