A lock flight chained into one group of more than 30 parts broke the
checklist's contract and made every decision about it fail; an entry now
names its nearest part and the first others, a portage lists at most 30
obstacles and a checklist at most 100 own entries. Reading along a line
takes in the parts of a lock the corridor cut off, so its data basis no
longer depends on how the route runs. A line or an area stands at the
middle of its extent, so adding a node leaves it in place, and an earlier
decision is judged by where the obstacle was, not by the route point of its
passage. The cache keeps its readings without their lines, for one data
version at a time, and the data version is read without the region
boundaries.
Maurice
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