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# Make a reduced Latin square out of each line of input
len = length {
str = toupper($0)
split("", let, ":")
for (i = 1; i <= len; i++)
let[i - 1] = substr(str, i, 1)
for (j in let)
for (k in let)
printf (k + 1 < len) ? "%s " : "%s\n", let[(k + j) % len]
}
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