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_default_1:
  l : [ l1, l2 ]

one:
  a : 1a
  b : bb
  c : cc

three:
  a : 3a
  b : 3b1
  c : 3c
  l : [ l3 ]

five:
  l : [ l5a, l5b ]

seven:
  z2 : a

  o1 : [ o1a ]
  u1 : [ u1a ]
  u2 : [ u2a ]
  u3 : [ u3a ]