OPHIUROIDS

do hi ho id is od oh oi op or os pi sh si so uh up us

dip dis dor dos duh dui duo dup hid hip his hod hop hos hup ids ods oho ohs ooh ops ors oud our phi pis piu pod poh poi poo pro psi pud pur pus rho rid rip rod sip sir sod sop sou sri sup udo upo ups urd urp

dips dish door dorp dors dour drip drop duos dups duro hips hods hood hoop hops hour irid iris odor oohs oops opus ordo ouds ouph ours phis pish piso pods pois pood pooh poor poos posh pour prod pros puds puri purs push rhos rhus rids rips rods rood roup rush ship shod shoo shop shri sidh soph sord sori soup sour spud spur surd udos updo urds urps