例句與造句

1. His publications covers a wide range of topics in graph theory and combinatorics;; convex polyhedra, quasigroups, special decompositions Hamiltonian paths, Latin squares, decompositions of complete graphs, perfect systems of difference sets, additive sequences of permutations, tournaments and combinatorial games theory.
2. It's difficult to find additive sequence in a sentence. 用additive sequence造句挺難的