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tactics trainer error

In this puzzle,

http://en.lichess.org/training/46017

only Qa7+ is accepted, but there is an equally fast mate from first move Qc7+

1. 79 [M5] 40.Qc7+ Ka4 41.Ra3+ Kxa3 42.Qa5+ Na4 43.Qb4+ Kxa2 44.Qb3#
2. 79 [M5] 40.Qa7+ Ba6 41.Ra3+ Na4 42.Rxa4+ bxa4 43.Qc7+ Bb6 44.Qxb6#

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