tronc rtonc tornc otrnc rotnc ortnc trnoc rtnoc tnroc ntroc rntoc nrtoc tonrc otnrc tnorc ntorc ontrc notrc rontc orntc rnotc nrotc onrtc nortc trocn rtocn torcn otrcn rotcn ortcn trcon rtcon tcron ctron rcton crton tocrn otcrn tcorn ctorn octrn cotrn roctn orctn rcotn crotn ocrtn cortn trnco rtnco tnrco ntrco rntco nrtco trcno rtcno tcrno ctrno rctno crtno tncro ntcro tcnro ctnro nctro cntro rncto nrcto rcnto crnto ncrto cnrto toncr otncr tnocr ntocr ontcr notcr tocnr otcnr tconr ctonr octnr cotnr tncor ntcor tcnor ctnor nctor cntor onctr noctr ocntr contr ncotr cnotr ronct ornct rnoct nroct onrct norct rocnt orcnt rcont cront ocrnt cornt rncot nrcot rcnot crnot ncrot cnrot oncrt nocrt ocnrt conrt ncort cnort
Note: these 'words' (valid or invalid) are all the permutations of the word tronc. These words are obtained by scrambling the letters in tronc.