PUZZLE: Alternate Colors Symmetric Patterns 2021

Welcome 2021: Mathematical Style

Below are few symmetric patterns made on the board of 9×9. These patterns are with two colors put in an alternate positions. One color numbering 20 and another 21, welcoming 2021. Since these are made manually, there is great chance of repetitions. Below are only 76 patterns, but there are much more possibilities. It is left for reader to bring more possibilities. It is interesting to bring similar results on 11×11 board.

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