Correcto: 3bx2  bx2, 15xd 2xd, 3d 8d, 4x3d2 7x3d2, -3xd3 6xd3, -7x -22x, dx xd, Incorrecto: 6b2 x  6bx2, 6d dt, 3d3 3d2, 3x xc, 4d 4c, -2g2 -2g4, -bd -bx,

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