(((((7,((4,2),6)),3),(8,(1,5))),(((7a,((4a,2a),6a)),3a),(8a,(1a,5a)))),((((7b,((4b,2b),6b)),3b),(8b,(1b,5b))),(((7ab,((4ab,2ab),6ab)),3ab),(8ab,(1ab,5ab)))));
(((((5,(6,4)),3),((1,(8,2)),7)),(((5a,(6a,4a)),3a),((1a,(8a,2a)),7a))),((((5b,(6b,4b)),3b),((1b,(8b,2b)),7b)),(((5ab,(6ab,4ab)),3ab),((1ab,(8ab,2ab)),7ab))));