DTV — Date Time Issue - time set2 is duration after time set1

The final submission document recorded the following issues about these verb concepts:

Immediately under the glossary entry "time set2 is duration value after time set1":
Issue: Should the second role be 'duration' instead of 'duration value'?
Under the Definition for that entry:
Issue: This is not quite right, because we do not have a verb concept that adds durations to time point sequences.
And similarly, immediately under the glossary entry for "time set2 is duration value before time set1":
Issue: Should the second role be 'duration' instead of 'duration value'?
Under the Definition for that entry:
Issue: This is not quite right, because we do not have a verb concept that subtracts durations from time point sequences

These two verb concepts are about adding or subtracting duration values from time sets. They are not used anywhere in the specification, are superfluous, and are deleted.