1+2+4: inner brow raiser + outer brow raiser + brow lowerer

1+2+4: inner brow raiser + outer brow raiser + brow lowerer

1+2+4: inner brow raiser + outer brow raiser + brow lowerer

frontalis, pars medialis + frontalis, pars lateralis + [corrugator supercilii, depressor supercilii, depressor glabellae (aka procerus)]

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