And now...the black keys of mini-JBJ Sermon Effectiveness Maximizer
The above is just the white keys!
5 black keys, the 'weekdays' could be the 5 Cs of liturgy, some kind of a 5-phase church year (Advent, Christmas, Easter, Pentecost, Public Vindication/A. D. 70), or a 4-phase that leaves the middle blank, or a 3-phase, etc.
Maybe the latter ones could be different colors.
The key, to use a pun, is that this comprehensives engenders timing, particular timing of what to do when, just as the whole engenders the parts, just as the Lord's Day is the head of the week.
Love in King Jesus,