doing oding diong idong oidng iodng donig odnig dnoig ndoig ondig nodig dinog idnog dniog ndiog indog nidog oindg iondg onidg noidg inodg niodg doign odign diogn idogn oidgn iodgn dogin odgin dgoin gdoin ogdin godin digon idgon dgion gdion igdon gidon oigdn iogdn ogidn goidn igodn giodn dongi odngi dnogi ndogi ondgi nodgi dogni odgni dgoni gdoni ogdni godni dngoi ndgoi dgnoi gdnoi ngdoi gndoi ongdi nogdi ogndi gondi ngodi gnodi dingo idngo dnigo ndigo indgo nidgo digno idgno dgino gdino igdno gidno dngio ndgio dgnio gdnio ngdio gndio ingdo nigdo igndo gindo ngido gnido oingd iongd onigd noigd inogd niogd oignd iognd ogind goind igond giond ongid nogid ognid gonid ngoid gnoid ingod nigod ignod ginod ngiod gniod
Note: these 'words' (valid or invalid) are all the permutations of the word doing. These words are obtained by scrambling the letters in doing.