the NQueens algorithm written in GF

examples/nqueens/NatAscii.gf

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+concrete NatAscii of Nat = {
+
+lincat Nat = Str ;
+
+lin zero   = "" ;
+    succ n = "_" ++ n ;
+
+lincat LT = Str ;
+       NE = {} ;
+       Plus = {} ;
+
+lin zLT n = n ;
+    sLT _ _ l = l ;
+
+}