numbs unmbs nmubs mnubs umnbs munbs nubms unbms nbums bnums ubnms bunms nmbus mnbus nbmus bnmus mbnus bmnus umbns mubns ubmns bumns mbuns bmuns numsb unmsb nmusb mnusb umnsb munsb nusmb unsmb nsumb snumb usnmb sunmb nmsub mnsub nsmub snmub msnub smnub umsnb musnb usmnb sumnb msunb smunb nubsm unbsm nbusm bnusm ubnsm bunsm nusbm unsbm nsubm snubm usnbm sunbm nbsum bnsum nsbum snbum bsnum sbnum ubsnm busnm usbnm subnm bsunm sbunm nmbsu mnbsu nbmsu bnmsu mbnsu bmnsu nmsbu mnsbu nsmbu snmbu msnbu smnbu nbsmu bnsmu nsbmu snbmu bsnmu sbnmu mbsnu bmsnu msbnu smbnu bsmnu sbmnu umbsn mubsn ubmsn bumsn mbusn bmusn umsbn musbn usmbn sumbn msubn smubn ubsmn busmn usbmn submn bsumn sbumn mbsun bmsun msbun smbun bsmun sbmun
Note: these 'words' (valid or invalid) are all the permutations of the word numbs. These words are obtained by scrambling the letters in numbs.