remove suspicious definition; restore 'klr 5'

set.mm

@@ -360,7 +360,7 @@ useful for discussing objects (beyond simply true or false).  In particular,
   $( $j
     syntax 'wff';
     syntax '|-' as 'wff';
-    unambiguous 'klr 12';
+    unambiguous 'klr 5';
   $)
 
   $( Declare typographical constant symbols that are not directly used
@@ -529148,22 +529148,6 @@ automatically a set (see ~ bj-mooreset ).  (Contributed by BJ,
       PUSURFGUOHUBUETUFTUGUHCIUMFUIABIDEGCUJUK $.
   $}
 
-  $( Syntax for maps-to notation for functions with two arguments. $)
-  cmpt2-bj $a class ( <. x , y >. e. A |-> B ) $.
-
-  ${
-    $d z x $.  $d z y $.  $d z A $.  $d z B $.
-    $( Define maps-to notation for functions with two arguments.  When ` A ` is
-       replaced by a product ` ( C X. D ) ` , this is equivalent to ~ df-mpo ,
-       but it is more compact, and is read more easily as a function of two
-       arguments (which can be hard with ~ df-mpo when the above ` C ` is
-       replaced with a long expression).  This definition is also more
-       versatile, since it can describe for instance a function on the unit
-       disc in ` RR^ 2 ` .  (Contributed by BJ, 15-Aug-2023.) $)
-    df-bj-mpt2 $a |- ( <. x , y >. e. A |-> B ) =
-                   { <. <. x , y >. , z >. | ( <. x , y >. e. A /\ z = B ) } $.
-  $}
-
   $( Syntax for maps-to notation for functions with three arguments. $)
   cmpt3 $a class ( x e. A , y e. B , z e. C |-> D ) $.