Now if we arranged them on a 2d grid, could use 4 cards, then the different shap...

mdiesel on July 28, 2020 | parent | context | favorite | on: How did anyone do math in Roman numerals? (2017)

Now if we arranged them on a 2d grid, could use 4 cards, then the different shapes (even discounting the similar looking shapes) would get you to >1000. You'd have to allow more than just the standard tetrominoes.