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. 2012 Jun 1;3:156. doi: 10.3389/fphys.2012.00156
Block 1 Block 2 Block 3 Block 4
[A 1 4 B C 9] [C 5 B 6 13 A] [12 B A 2 3 C] [7 A 8 C B 10 11]