SUBINFORM

bi bo if in is mi mo mu no nu of oi om on or os si so um un us

bin bio bis bos bro bum bun bur bus fib fin fir fob fon for fou fro fub fun fur ifs ins ion ism mib mir mis mob mon mor mos mun mus nib nim nob nom nor nos nub nus obi oms ons orb ors our rib rif rim rin rob rom rub rum run sib sim sin sir sob som son sou sri sub sum sun uns urb urn

bins bios biro born brim brin brio bris bros bumf bums buns burn burs fibs fino fins firm firn firs fobs foin fons forb form four from fubs funs furs info inro ions iron mibs mirs miso mobs mons morn mors muni muns muon nibs nims nobs noir noms nori norm nous nubs numb obis onus orbs ours ribs rifs rims rins robs roms rubs ruin rums runs snib snob snub sorb sori sorn sour sumo surf umbo urbs urns