go =>
  L = [
        [12,18],
        [-6,14],
        [35,0],
        [7,10],
        [2562047788015215500854906332309589561,6795454494268282920431565661684282819]
      ],
  foreach([X,Y] in L)
     println((X,Y)=lcm(X,Y))
  end,

  println('1..20'=lcm(1..20)),
  println('1..50'=lcm(1..50)),
  nl.