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#!/bin/bash
bc <<<'
define row (t,j) { auto n, p, b
m = 642;
for ( i=1; i<=8; i++ ) {
print 4," ",t+n-p+b," ",t+n+1-p+b," ",t+n+m-p," ",t+n+m+1-p++,"\n"
n+=m;...

Try also


awk '
T[NR]=$0

END {for (k=1; k<=REP; k++) {++INC
print "----"
for (j=1; j<=NR; j++) {$0 = T[j]
...

see if it helps.
If sapa.txt is:

4 0 1 642 643
4 642 643 1283 1284
4 1283 1284 1924 1925
4 1924 1925 2565 2566
4 2565 2566 3206 3207
4 3206 3207 3847 3848
4 3847 3848 4488 4489
4 4488 4489...