Section 2 - Utility functions - unindexed

The stored_preceding is a number that varies. The stored_preceding is 0.

[ 0: first activity this turn, 1 : some activity precedes, 2: same activity precedes]

To mark (E - activity) activities:
    repeat through the Table of Scheduled Events:
        if the SA_Event entry is E, change the SA_Similar entry to 1.

To unmark similar entries:
    repeat through the Table of Scheduled Events:
        change the SA_Similar entry to 0.

[ The next check is done to account for time advancements of more than one minute. ]

To check skipped events:
    unless skipped events, rule succeeds;
    while skipped events:
        repeat through the Table of Scheduled Events in SA_Moment order:
            if there is a SA_Target entry, carry out the SA_Event entry activity with the SA_Target entry;
            otherwise carry out the SA_Event entry activity;
            if a paragraph break is pending, say conditional paragraph break;
            blank out the whole row.
    
To decide if skipped events:
    repeat through the Table of Scheduled Events:
        if there is a SA_Moment entry and the SA_Moment entry is before the time of day and 30 minutes after the SA_Moment entry is after the time of day, decide yes;
    decide no.

To decide if (item - object) satisfies (collection - description): (- {collection}({item}) -).