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.tex file checkins for credit at meeting and review if anybody wants to.

The total number of sheets in course can be tremendous, since it is
the number of students times the number of assessments. LON-CAPA
caches these sheets and only selectively invalidates those cache
copies if potentially relevant data changes. \textbf{Completely
Recalc} forces LON-CAPA to invalidate all cache copies.

For instance, this is necessary to get the most up-to-date
calculations if the sheet itself contains direct access to the system
clock (making it ``out-of-date'' the moment it is calculated), or if
an assessment is edited in a way that would retroactively change
grading. The automatic spreadsheet invalidation catches student
submissions, \textbf{PAR}a\textbf{M}eter changes, and spreadsheet
changes, but not re-publication of a problem resource.