Stuff

 for (a=0; a <= 7; a++) {
                for (b=0; b <= 7; b++) {
                        for (c=0; c <= 7; c++) {
                                for     (d=0; d <= 7; d++) {
                                        for (e=0; e <= 7; e++) {
                                                printf ("%s%s%s%s%s\n",firstletter[a],secondletter[b],thirdletter[c],fourthletter[d],fifthletter[e]);
                                        }
                                }
                        }
                }
        }

}