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