19.cs

/* LINQ Puzzle #19 *******************************************************

Summary: Given a list integers, generate every pairwise combination of integers. Order of the pair 
doesn't matter, but { 1, 2 } is the same as { 2, 1 } and you shouldn't have duplicates.

Sample: { 1, 2, 3, 4 } => {{1, 2}, {1, 3}, {1, 4}, {2, 3}, {2, 4}, {3, 4}}

************************************************************************/

var ints = new [] { 1, 2, 3, 4 };