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(x+4) la a 2
(y+3)la a 2
(2x+1) la a 2
(3y+2) la a 2
(x+2y) la a 2
(2a +5b)la a 2
(b+3c)la a 2
(3m + n )la a 2
(4 x +z) la a 2
(6x+5a) la a 2