BIDIAGONAL

aa ab ad ag ai al an ba bi bo do go id in la li lo na no od oi on

aal aba abo ado aga ago aid ail ain ala alb ana and ani baa bad bag bal ban bid big bin bio boa bod bog dab dag dal dan dib dig din dog dol don gab gad gal gan gib gid gin goa gob god ion lab lad lag lib lid lin lob log nab nag nib nil nob nod nog oba obi oda oil old

agin agio agon alan alba alga anal anga anil anoa baal bail bald band bang bani bidi bind biog blin blog boil bola bold bond bong dago dang dial ding dino diol dona dong gadi gain gala gaol gild glad glia glib glob goad goal gold idol ilia inia laid lain land lang lido ling lino lion load loan loid loin long nada nail nala naoi nidi nodi noil obia