next(1,2). next(2,3). next(3,4). next(4,5). next(5,6). next(6,7). next(7,8). next(8,9). next(9,10). next(10,11). next(11,12). next(12,13). next(13,14). next(14,15). next(15,16). next(16,17). next(17,18). next(18,19). next(19,20). next(20,21). next(21,22). next(19,23). next(23,24). next(24,25). next(25,26). next(26,27). next(27,28). next(28,29). next(29,30). next(30,31). next(18,32). next(32,33). next(33,34). next(34,35). next(35,36). next(36,37). next(16,38). next(38,39). next(39,40). next(40,41). next(41,42). next(39,43). next(43,44). next(44,45). next(38,46). next(46,47). doAt(startflow,5). doAt(a19,8). doAt(a15,12). doAt(a25,14). doAt(a17,15). doAt(a11,16). doAt(a14,17). doAt(a8,18). doAt(a10,19). doAt(a5,20). doAt(endflow,21). doAt(a13,23). doAt(a3,24). doAt(a1,25). doAt(a12,26). doAt(a23,27). doAt(a9,28). doAt(a22,29). doAt(endflow,30). doAt(a16,32). doAt(a20,33). doAt(a7,34). doAt(a4,35). doAt(endflow,36). doAt(a18,38). doAt(a24,39). doAt(a21,40). doAt(endflow,41). doAt(a2,43). doAt(endflow,44). doAt(endflow,46). compAt(a19,x6,6). compAt(a25,x13,10). compAt(a25,x21,11). subsAt(a19,7). subsAt(a15,9). subsAt(a25,13). leftrightnexts(20,23). leftrightnexts(19,32). leftrightnexts(40,43). leftrightnexts(39,46). leftrightnexts(17,38).