cauld aculd cuald ucald aucld uacld calud aclud claud lcaud alcud lacud culad uclad cluad lcuad ulcad lucad aulcd ualcd alucd laucd ulacd luacd caudl acudl cuadl ucadl aucdl uacdl cadul acdul cdaul dcaul adcul dacul cudal ucdal cdual dcual udcal ducal audcl uadcl aducl daucl udacl duacl caldu acldu cladu lcadu alcdu lacdu cadlu acdlu cdalu dcalu adclu daclu cldau lcdau cdlau dclau ldcau dlcau aldcu ladcu adlcu dalcu ldacu dlacu culda uclda cluda lcuda ulcda lucda cudla ucdla cdula dcula udcla ducla cldua lcdua cdlua dclua ldcua dlcua uldca ludca udlca dulca lduca dluca auldc ualdc aludc laudc uladc luadc audlc uadlc adulc daulc udalc dualc alduc laduc adluc daluc ldauc dlauc uldac ludac udlac dulac lduac dluac
Note: these 'words' (valid or invalid) are all the permutations of the word cauld. These words are obtained by scrambling the letters in cauld.