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diff --git a/examples/jem-math/LexMath.gf b/examples/jem-math/LexMath.gf
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+interface LexMath = open Syntax in {
+
+oper
+ zero_PN : PN ;
+ successor_N2 : N2 ;
+ sum_N2 : N2 ;
+ product_N2 : N2 ;
+ even_A : A ;
+ odd_A : A ;
+ prime_A : A ;
+ equal_A2 : A2 ;
+ small_A : A ;
+ great_A : A ;
+ divisible_A2 : A2 ;
+ number_N : N ;
+}