2ndspos s N cons X 2ndspos s N cons2 Z 2ndspos s N cons2 cons Y rcons posrecip Y 2ndsneg N Z 2ndsneg s N cons X 2ndsneg s N cons2 Z 2ndsneg s N cons2 cons Y rcons negrecip Y 2ndspos N Z from X cons X 2ndspos 0 Z rnil 2ndsneg 0 Z rnil pi X 2ndspos X from 0 plus 0 Y Y plus s X Y s plus X Y times 0 Y 0 times s X Y plus Y times X Y square X times X X 2ndspos 2 s 1 cons 1 cons2 1 rcons 2 posrecip 1 2ndsneg 2 negrecip 1 from 1 0 0 rnil 0 pi 1 plus 2 times 2 square 1 FULL ./TRS/TRCSR/ExAppendixB_AEL03_L.trs