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Yeah I noticed that it was faster than the other solution :)

---------- Post updated at 03:38 PM ---------- Previous update was at 03:35 PM ----------

Can you include another associative array...

awesome ..... Your comments will help me experiment with some of the commands .. appreciate your comments :)
Have a nice evening

could you please comment on the code to make me understand a bit

thanks for your help though :)

This worked perfectly !

Could you please comment on the following to let me know what it means. That will be a great help in understanding the code for me to experiment.

for i in $(tail -n+2...

Present means existing.

To break it down for example
An entry called 0 is present in all columns a, b, c and d and thus its existence is denoted by 1, 1, 1, and 1 under a, b, c and d;
An entry...

Hi All,
I have a long list made of 4 columns containing entries such as the following example:
a b c d
0 0 0 0
1 2 1 2
2 5 3 4
3 8 4 6
4 10 9 ...