== Riga 1 ==
VARIABLE
OR
CONSTANT
== Riga 2 ==
TYPED
CONSTANTS
CAN
BE
COMPARED
TO
INITIALIZED
VARIABLES
VARIABLES
WHOSE
VALUES
ARE
DEFINED
ON
ENTRY
TO
THEIR
BLOCK
USUALLY
EVENT
HANDLER
== Riga 3 ==
SUCH
A
VARIABLE
IS
INITIALIZED
ONLY
WHEN
THE
PROGRAM
STARTS
RUNNING
== Riga 4 ==
AFTER
THAT
THE
VALUE
OF
A
TYPED
CONSTANT
PERSISTS
BETWEEN
SUCCESSIVE
CALLS
TO
THEIR
PROCEDURES
