Accept operands that are all bras, and turn that into to bra of the
    operation applied to all corresponding kets

def accept_bras(cls, ops, kwargs):
    """Accept operands that are all bras, and turn that into to bra of the
    operation applied to all corresponding kets"""
    from qnet.algebra.core.state_algebra import Bra
    kets = []
    for bra in ops:
        if isinstance(bra, Bra):
            kets.append(bra.ket)
        else:
            return ops, kwargs
    return Bra.create(cls.create(*kets, **kwargs))