doc-src/Tutorial/Datatype/absubstb
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     1   "substb s (Less a1 a2) = Less (substa s a1) (substa s a2)"
       
     2   "substb s (And b1 b2) = And (substb s b1) (substb s b2)"
       
     3   "substb s (Neg b) = Neg (substb s b)"