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No, all it does is assigns the modulus of NR divided by 40 to a new variable, to save having to type NR%40 instead of nr in the rest of the code.

Try this solution:

#!/bin/awk -f
function printem() {
for (i in a) { print a[i] ; delete a[i] }
for (i in b) { print b[i] ; delete b[i] }
for (i in c) { print c[i] ;...