sings isngs snigs nsigs insgs nisgs signs isgns sgins gsins igsns gisns sngis nsgis sgnis gsnis ngsis gnsis ingss nigss ignss ginss ngiss gniss sinsg isnsg snisg nsisg inssg nissg sisng issng ssing ssing issng sisng snsig nssig ssnig ssnig nssig snsig inssg nissg isnsg sinsg nsisg snisg sigsn isgsn sgisn gsisn igssn gissn sisgn issgn ssign ssign issgn sisgn sgsin gssin ssgin ssgin gssin sgsin igssn gissn isgsn sigsn gsisn sgisn sngsi nsgsi sgnsi gsnsi ngssi gnssi snsgi nssgi ssngi ssngi nssgi snsgi sgsni gssni ssgni ssgni gssni sgsni ngssi gnssi nsgsi sngsi gsnsi sgnsi ingss nigss ignss ginss ngiss gniss insgs nisgs isngs sings nsigs snigs igsns gisns isgns signs gsins sgins ngsis gnsis nsgis sngis gsnis sgnis
Note: these 'words' (valid or invalid) are all the permutations of the word sings. These words are obtained by scrambling the letters in sings.