In the normal_map, color_map, pigment_map entries there is a
value for each entry. Like this: 
normal {
    gradient x       //this is the PATTERN_TYPE
    normal_map {
      [a  bumps scale 2]
      [b  dents]
      [c  dents]
      [d  marble turbulence 1]
    }
  }

Does d have to be >= c? And c >= b? And b >= a? Or can a,b,c,d be
any value? 

Is the following valid?
normal {
    gradient x       //this is the PATTERN_TYPE
    normal_map {
      [0.3  bumps scale 2]
      [0.2  dents]
      [0.6  dents]
      [0.5  marble turbulence 1]
    }
  }
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