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`desing/substitute`

Performing variable elimination by substitution in a chart-record.

Input:
 
O
a chart record,
SUB
the list of pairs [k, eq], where k is an index to the S member of the chart, and eq is the substitution equation for it.
Output:
the chart-record with the given substitutions performed.
The substitutions eliminates the listed affine variables of the chart, reducing drastically the time needed for Gröbner basis computations on its data.
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