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# Instead of these               these or               these?
$lvalue  ?<:= $rvalue;   $lvalue  <:= $rvalue;   $lvalue ?<:  $rvalue;
+     
...
$lvalue ?gt:= $rvalue;   $lvalue le:= $rvalue;   $lvalue ?gt: $rvalue;
+     
$lvalue ?ge:= $rvalue;   $lvalue gt:= $rvalue;   $lvalue ?ge: $rvalue;
+     
$lvalue ?le:= $rvalue;   $lvalue ge:= $rvalue;   $lvalue ?le: $rvalue;