1 iterating on an object of class [I
   2 forEach 0
   3 forEach 1
   4 forEach 2
   5 forEach 3
   6 reduce 0 1
   7 reduce 1 2
   8 reduce 3 3
   9 left sum 6
  10 reduceRight 3 2
  11 reduceRight 5 1
  12 reduceRight 6 0
  13 right sum 6
  14 squared 0,1,4,9
  15 iterating on an object of class java.util.ArrayList
  16 forEach 1
  17 forEach 3
  18 forEach 5
  19 forEach 7
  20 reduce 1 3
  21 reduce 4 5
  22 reduce 9 7
  23 left sum 16
  24 reduceRight 7 5
  25 reduceRight 12 3
  26 reduceRight 15 1
  27 right sum 16
  28 squared 1,9,25,49
  29 iterating on [object Array]
  30 forEach 2
  31 forEach 4
  32 forEach 6
  33 forEach 8
  34 reduce 2 4
  35 reduce 6 6
  36 reduce 12 8
  37 left sum 20
  38 reduceRight 8 6
  39 reduceRight 14 4
  40 reduceRight 18 2
  41 right sum 20
  42 squared 4,16,36,64