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rule1 = {(x_*b) ** (y_*d) -> x*y*(b ** d), (x_*d) ** (y_*b) -> x*y*(d ** b)};
rule2 = {b ** d -> -d ** b};
t1 = (a*b) ** (c*d) + (x*d) ** (y*b)
t1 = t1 /. rule1 /. rule2
Coefficient[t1, d ** b]
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<< NC`;
<< NCAlgebra`;
t1 = (AA1 ** b) ** (AA2 ** d) + (AA3 ** d) ** (AA4 ** b)
t1 = Substitute[t1, b ** d -> -d ** b]
NCCollect[t1, d ** b]
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