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+--1 Symbolic expressions
+
+-- *Note*. This module is not automatically included in the main
+-- grammar [Lang Lang.html].
+
+abstract Symbol = Cat, PredefAbs ** {
+
+--2 Noun phrases with symbols and numbers
+
+fun
+
+  SymbPN   : Symb -> PN ;                -- x
+  IntPN    : Int -> PN ;                 -- 27
+  FloatPN  : Float -> PN ;               -- 3.14159
+  NumPN    : Card -> PN ;
+  CNNumNP  : CN -> Card -> NP ;          -- level five ; level 5
+  CNSymbNP : Det -> CN -> [Symb] -> NP ; -- (the) (2) numbers x and y
+
+
+--2 Sentence consisting of a formula
+
+  SymbS    : Symb -> S ;                 -- A
+
+--2 Symbols as numerals
+
+  SymbNum  : Symb -> Card ;              -- n
+  SymbOrd  : Symb -> Ord ;               -- n'th
+
+--2 Symbol lists
+
+-- A symbol list has at least two elements. The last two are separated
+-- by a conjunction ("and" in English), the others by commas.
+-- This produces "x, y and z", in English. 
+
+cat
+  Symb ;
+  [Symb]{2} ;
+
+fun
+  MkSymb : String -> Symb ;
+
+--2 Obsolescent
+
+  CNIntNP  : CN -> Int -> NP ;           -- level 53 (covered by CNNumNP)
+
+}