150 NEW: :
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     The send (:) operator is used to construct messages that can be
     sent to objects.  A message has the form:

     <object>:<selector>([<argList>])

     where <object> represents the object the message is sent and
     <selector> represents the operation (method) to perform.  If the
     <selector> is an exported instance variable, the variable is
     accessed and its value is returned.