A related question on Stack Overflow:
i dont understand it properly..how 6,8,11 is a valid set ?
NOTE: That link has moved. It is now HERE: https://www.setgame.com/sites/default/files/instructions/SET%20INSTRUCTIONS%20-%20ENGLISH.pdf
Also, I think you make a 'set' by combining 3 different cards so that, when combined, have 0 1 and 2 in each column or one of those options across entire column
for 2 7 8:
1 1 1 1
0 0 0 0
2 2 2 2
-- has 0, 1, 2 in each column
for 6 8 11,
1 0 1 2
2 2 2 2
0 1 0 2
-- has 0, 1, 2 in first three column and all 2s in last column
Thank you, @Highphi. The link to instructions has been updated.
trying to do it without a for-loop
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