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A: Squares C: Odd Squares
_______ _______
/ \ / \
| 1 | | 1 |
\_______/ \_______/
\ / \
| | 9 |
| \_______/
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
/ / \
\_______/ / \
| 16 | | 25 |
\_______/ \__________/
| | | |
| | | |
/ \ / \
E = {0, 1, 2, ..., 19}