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+%------------------------------------------------------------------------------
+% File     : SYN000+1 : TPTP v5.5.0. Released v4.0.0.
+% Domain   : Syntactic
+% Problem  : Basic TPTP FOF syntax
+% Version  : Biased.
+% English  : Basic TPTP FOF syntax that you can't survive without parsing.
+
+% Refs     :
+% Source   : [TPTP]
+% Names    :
+
+% Status   : Theorem
+% Rating   : 0.43 v5.5.0, 0.48 v5.4.0, 0.46 v5.3.0, 0.52 v5.2.0, 0.40 v5.1.0, 0.43 v5.0.0, 0.54 v4.1.0, 0.57 v4.0.1, 0.78 v4.0.0
+% Syntax   : Number of formulae    :   12 (   5 unit)
+%            Number of atoms       :   31 (   3 equality)
+%            Maximal formula depth :    7 (   4 average)
+%            Number of connectives :   28 (   9   ~;  10   |;   3   &)
+%                                         (   1 <=>;   3  =>;   1  <=)
+%                                         (   1 <~>;   0  ~|;   0  ~&)
+%            Number of predicates  :   16 (  10 propositional; 0-3 arity)
+%            Number of functors    :    8 (   5 constant; 0-3 arity)
+%            Number of variables   :   13 (   0 sgn;   5   !;   8   ?)
+%            Maximal term depth    :    4 (   2 average)
+% SPC      : FOF_THM_RFO_SEQ
+
+% Comments :
+%------------------------------------------------------------------------------
+%----Propositional
+fof(propositional,axiom,
+    ( ( p0
+      & ~ q0 )
+   => ( r0
+      | ~ s0 ) )).
+
+%----First-order
+fof(first_order,axiom,(
+    ! [X] :
+      ( ( p(X)
+        | ~ q(X,a) )
+     => ? [Y,Z] :
+          ( r(X,f(Y),g(X,f(Y),Z))
+          & ~ s(f(f(f(b)))) ) ) )).
+
+%----Equality
+fof(equality,axiom,(
+    ? [Y] :
+    ! [X,Z] :
+      ( f(Y) = g(X,f(Y),Z)
+      | f(f(f(b))) != a
+      | X = f(Y) ) )).
+
+%----True and false
+fof(true_false,axiom,
+    ( $true
+    | $false )).
+
+%----Quoted symbols
+fof(single_quoted,axiom,
+    ( 'A proposition'
+    | 'A predicate'(a)
+    | p('A constant')
+    | p('A function'(a))
+    | p('A \'quoted \\ escape\'') )).
+
+%----Connectives - seen |, &, =>, ~ already
+fof(useful_connectives,axiom,(
+    ! [X] :
+      ( ( p(X)
+       <= ~ q(X,a) )
+    <=> ? [Y,Z] :
+          ( r(X,f(Y),g(X,f(Y),Z))
+        <~> ~ s(f(f(f(b)))) ) ) )).
+
+%----Annotated formula names
+fof(123,axiom,(
+    ! [X] :
+      ( ( p(X)
+        | ~ q(X,a) )
+     => ? [Y,Z] :
+          ( r(X,f(Y),g(X,f(Y),Z))
+          & ~ s(f(f(f(b)))) ) ) )).
+
+%----Roles
+fof(role_hypothesis,hypothesis,(
+    p(h) )).
+
+fof(role_conjecture,conjecture,(
+    ? [X] : p(X) )).
+
+%----Include directive
+include('Axioms/SYN000+0.ax').
+
+%----Comments
+/* This
+   is a block
+   comment.
+*/
+
+%------------------------------------------------------------------------------