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Section 8.12.1.14:
$ORDINAL

succ : NTP ; -- This feature returns the ordinal number which is next in sequence -- after self. succ( count : NTP ) : NTP ; -- This feature returns the ordinal number which is offset towards a -- higher number by count from self! pred : NTP ; -- This feature returns the ordinal number which precedes self in -- sequence. pred( count : NTP ) : NTP ; -- This feature returns the ordinal number which is offset towards a -- lower number by count from self!
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