Which one is out?
see discussion in Tanya's Math blog.
h/t Victor Agroskine
my solution is #2 (see the difference table below):
| 1 | 2 | 3 | 4 | 5 | |
| 1 | frame | shape | size | size | |
| 2 | frame | frame | frame | frame | |
| 3 | shape | frame | color shape | shape size | |
| 4 | color | frame | color shape | color size | |
| 5 | size | frame | shape size | color size |
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