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Jun 19, 2019 at 16:45 comment added Luc Guyot About your second to last sentence: the rotation angles of $ab$ and $ba$ are the same.
Jun 17, 2019 at 9:10 vote accept Daniel
Jun 14, 2019 at 8:21 history edited Daniel CC BY-SA 4.0
deleted 6 characters in body
Jun 14, 2019 at 8:13 history answered Daniel CC BY-SA 4.0