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  1. or download this
    { a => { b1=> { c11 => vc11, c12 => vc12 }, b2 => { c21 => vc21, c22 =
+> vc22 } } }
  2. or download this
    { c21 => vc21, c22 => vc22 }, level=3
{ c11 => vc11, c21 => vc12 }, level=3
{ b2 => ?, b1 => ? }, level=2
{ a => ? }, level =1.