Brihajjataka 13.4

13.4

triṃśat sa rūpāḥ sunaphā anaphā ākhyāḥ ṣaṣṭitrayaṃ daurudhure prabhedāḥ/
icchā vikalpaiḥ kramaśo abhinīya nīte nivṛttiḥ punar anya nītiḥ//(indravajrā)

There are thirty-one varieties designated Sunaphā and Anaphā; / threefold sixty [are the varieties] in Durudhurā. / Having brought them out in order through the options of permutations, when one has reached the end, a return is again another method.