What is your hint or solution suggestion?

function pairwise(arr, arg) {
  const indices =[]
  arr.forEach((e,i) => {
    let res = arr.filter((e1,i1)=> e1==(arg-e) && i1>i)[0];
    let ind = arr.indexOf(res,i+1)
    if (ind!=-1) { 
  return indices.reduce((a,b)=> a+b, 0)

Challenge: Pairwise

Link to the challenge:

Hello there.

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