Split an Array into all possible Combinations of Subsets of length 2 -


i have array, say

ar = [1,2,3,4,5]

i need find list of arrays (or matrix) contains possible ways split array exhaustive sets of pairs.

eg. 

[  [[1,2],[3,4],[5]],  [[1,2],[3,5],[4]],  [[1,2],[4,5],[3]],  [[1,3],[2,4],[5]]  ...  [[1,5],[3,4],[2]]                   ]

please try use pseudocode, or refrain using language-specific functions

i give intuition solve type of question. first can see problem can solved recursively. why that?

first take 2 elements array,

then solve same problem rest of elements of array.

if length of array 2 or 1 stop.

following rough pseudo code.

solve(arr){     if len(arr)==1 or 2{         return arr     }      take 2 elements     (say [1, 5])     remainder = [2, 3, 4]     solve(remainder) }

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