Best Friends

These digits are not just good friends, not even just best friends. That’s a relative term, after all, not an absolute term. These digit pairs aren’t just best friend, they’re inseparable. Just try it: you’ll break the puzzle!

Keep smiling, keep shining / Knowing you can always count on me for sure // That’s what friends are for // In good times, in bad times / I’ll be on your side forevermore // Oh, that’s what friends are for // – Dionne Warwick

Sometimes people just “click,” best friends forever. It happens to digits, too! In some columns, and some rows, certain pairs of digits are inseparable.