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added 13 characters in body

edited May 22, 2024 at 0:24

edited May 22, 2024 at 0:24

JavaScript (Node.js), 8077 bytes

f=(x,a)=>x.flatMap(b=>a!=b&x.includes(b.slice(!a,a?a&&-1:1/0))?a?[[a,b]]:f(x,b):[])

-3B from Arnauld

f=(x,a)=>x.flatMap(b=>a!=b&x.includes(b.slice(!a,a?-1:1/0))?a?[[a,b]]:f(x,b):[])

f=(x,a)=>x.flatMap(b=>a!=b&x.includes(b.slice(!a,a&&-1))?a?[[a,b]]:f(x,b):[])

-3B from Arnauld

added 2 characters in body

edited May 21, 2024 at 14:32

edited May 21, 2024 at 14:32

x=>x.flatMapf=(a=>xx,a)=>x.flatMap(b=>a!=b&x.includes(a.slice(1))&x.includes(b.slice(0!a,a?-1:1/0))?a?[[a,b]]:[]f(x,b):[])

x=>x.flatMap(a=>x.flatMap(b=>a!=b&x.includes(a.slice(1))&x.includes(b.slice(0,-1))?[[a,b]]:[]))

f=(x,a)=>x.flatMap(b=>a!=b&x.includes(b.slice(!a,a?-1:1/0))?a?[[a,b]]:f(x,b):[])

answered May 21, 2024 at 14:26

answered May 21, 2024 at 14:26

x=>x.flatMap(a=>x.flatMap(b=>a!=b&x.includes(a.slice(1))&x.includes(b.slice(0,-1))?[[a,b]]:[]))