{"raw_statement":[{"iden":"problem statement","content":"There are $N$ persons, conveniently numbered $1$ through $N$. They will take _3y3s Challenge_ for $N-1$ seconds.\nDuring the challenge, each person must look at each of the $N-1$ other persons for $1$ seconds, in some order.\nIf any two persons look at each other during the challenge, the challenge ends in failure.\nFind the order in which each person looks at each of the $N-1$ other persons, to be successful in the challenge."},{"iden":"constraints","content":"*   $2 \\leq N \\leq 100$"},{"iden":"input","content":"The input is given from Standard Input in the following format:\n\n$N$"},{"iden":"sample input 1","content":"7"},{"iden":"sample output 1","content":"2 3 4 5 6 7\n5 3 1 6 4 7\n2 7 4 1 5 6\n2 1 7 5 3 6\n1 4 3 7 6 2\n2 5 7 3 4 1\n2 6 1 4 5 3"},{"iden":"sample input 2","content":"2"},{"iden":"sample output 2","content":"\\-1"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}