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# printf "%s\t%s\t%s\t%s\t%s\n" "" a b c d && awk 'NR>1{for (i=1;i<NF+1;i++) {I[$i]=$i;++J[$i]};A[$1]=($1==0)?1:$1;B[$2]=($2==0)?1:$2;C[$3]=($3==0)?1:$3;D[$4]=($4==0)?1:$4}END{for (j in I) print...

Note that my solution scan the file only once ... less I/O !

printf "%s\t%s\t%s\t%s\t%s\n" "" a b c d|Display the first line using \t as <tab> separator and \n for a newline
&&|logical "AND" : if left side got processed with return code 0, then process right...

# cat tst
a b c d
0 0 0 0
1 2 1 2
2 5 3 4
3 8 4 6
4 10 9 8
5 15 8 10
# printf "%s\t%s\t%s\t%s\t%s\n" "" a b c d && awk 'NR>1{for...