Collection {#394
  #items: array:19 [
    0 => 2
    1 => 1
    2 => 5
    3 => 7
    4 => 10
    5 => 11
    6 => 31
    7 => 15
    8 => 18
    9 => 20
    10 => 36
    11 => 24
    12 => 25
    13 => 26
    14 => 28
    15 => 29
    16 => 33
    17 => 34
    18 => 37
  ]
}