let answer = coords1_intoXY.filter(coords1 => coords2_intoXY.every(coords2 => {
  let x = Number(coords1[0]) - Number(coords2[0])
  let y = Number(coords1[1]) - Number[coords2[1]]
  return Math.hypot(x, y) < 5
}))

return answer.map(coords => coords.join('|'));