signa isgna sgina gsina igsna gisna singa isnga sniga nsiga insga nisga sgnia gsnia sngia nsgia gnsia ngsia ignsa ginsa ingsa nigsa gnisa ngisa sigan isgan sgian gsian igsan gisan siagn isagn saign asign iasgn aisgn sgain gsain sagin asgin gasin agsin igasn giasn iagsn aigsn gaisn agisn sinag isnag sniag nsiag insag nisag siang isang saing asing iasng aisng snaig nsaig sanig asnig nasig ansig inasg niasg iansg ainsg naisg anisg sgnai gsnai sngai nsgai gnsai ngsai sgani gsani sagni asgni gasni agsni snagi nsagi sangi asngi nasgi ansgi gnasi ngasi gansi agnsi nagsi angsi ignas ginas ingas nigas gnias ngias igans gians iagns aigns gains agins inags niags iangs aings naigs anigs gnais ngais ganis agnis nagis angis
Note: these 'words' (valid or invalid) are all the permutations of the word signa. These words are obtained by scrambling the letters in signa.