[{"title":"(7个子文件1000KB)组合数学IntroductoryCombinatorics-第五版部分章节课后习题答案","children":[{"title":"ex8sol.pdf <span style='color:#111;'>136.84KB</span>","children":null,"spread":false},{"title":"ex5sol.pdf <span style='color:#111;'>157.11KB</span>","children":null,"spread":false},{"title":"ex4sol.pdf <span style='color:#111;'>168.88KB</span>","children":null,"spread":false},{"title":"ex6sol.pdf <span style='color:#111;'>168.20KB</span>","children":null,"spread":false},{"title":"ex2sol.pdf <span style='color:#111;'>170.00KB</span>","children":null,"spread":false},{"title":"ex3sol.pdf <span style='color:#111;'>126.28KB</span>","children":null,"spread":false},{"title":"ex7sol.pdf <span style='color:#111;'>151.44KB</span>","children":null,"spread":false}],"spread":true}]