BIRATIONAL

aa ab ai al an ar at ba bi bo in it la li lo na no oi on or ta ti to

aal aba abo ail ain air ait ala alb alt ana ani ant arb art baa bal ban bar bat bin bio bit boa bot bra bro ion lab lar lat lib lin lit lob lot nab nib nil nit nob nor not oar oat oba obi oil ora orb ort rai ran rat ria rib rin rob rot tab tan tao tar til tin ton tor

abri airn airt alan alar alba alit alto anal anil anoa anta anti aria aril baal bail bait bani barn bint birl biro blat blin blot boar boat boil bola bolt bora born bort bota bran brat brin brio brit ilia inia inro inti into iota iron lain lair lari lati liar lino lint lion lira liri loan loin lorn lota loti nail nala naoi noil noir nori nota obia obit oral raia rail rain rani rant rato rial riot roan roil rota roti rotl tail tain tala tali tarn taro tirl tiro toil tola tora tori torn trio