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public c v1 · immutable#define f(X,g,p,N,M)M{return X?a&b?a&b&1<<i&&m(b,a^1<<i,9)>8?i:M:0:9;}main(){\int a=511,b=a,i=4;for(;X;b^=1<<N)a^=1<<g-'1',g,p(N+'1'),p('\n');} /* 123 */f(i--&&b&7&&b&56&&b&448&&b&73&&b&146&&b&292&&b /* John Rickard */ /* 456 */&273&&b&84,getchar(),putchar,m(b,a,9),m(a,b,i)) /* xxx@xxxx.xx.xx */ /* 789 *