a-a a-b a-c a-z aaa aab aac aad aae aaz ab- aba abb abc abd abe abz ac- aca acb acc acd ace acz ad- ada adb adc add ade adz aea aeb aec aed aee aez az- aza azb azd aze azz baa bab bac bad bae baz bba bbb bbc bbd bbe bca bcb bcc bcd bce bcz bda bdb bdc bdd bde bdz be- bea beb bec bed bee bez bza bzd bze bzz c-- caa cab cac cad cae caz cba cbb cbc cbd cbe cbz cca ccb ccc ccd cce ccz cda cdb cdc cdd cde cdz ce- cea ceb cec ced cee cez cz- czc czd cze daa dab dac dad dae daz dba dbb dbc dbd dbe dbz dca dcb dcc dcd dce dda ddb ddc ddd dde ddz de- dea deb dec ded dee dez dza dzb dzd dze eaa eab eac ead eae eaz eba ebb ebc ebd ebe ec- eca ecb ecc ecd ece ed- eda edb edc edd ede eea eeb eec eed eee eze ezz zaa zab zac zad zaz zbb zbc zce zea zeb zec zed zee zez zzz