def product_bases(w):
nc = w.args_cnc()[1]
return len(nc) == 2 or len(nc) == 1 and nc[0].is_Pow and nc[0].exp == 2
but could you have b1**2*b1**2 -> b1**4 in which case the test above would
be nc[0].exp.is_Integer and sqrt(nc[0].exp).is_Integer might be better?
Could you have (b1**(x*Rational(1, 3)))**2?
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