``desing/exdsh``

Computes the sections of an ideal sheaf supported on the excptional
locus.

**Input:**-
**LSC**- a list of pairs
*(V,n)*, where *V* is a string which
identifies the blowing up center that gave rise to the exceptional
component in question using the Villamayor function value that
characterizes the center in the resolution process. The natural
number *n* gives the exponent of the factor of the sheaf supported
on the selected exceptional divisor. By default the exponent is 0.

**Output:**- -

The procedure assumes that `chartHistory` contains the chart
tree of a computed seqence of blowing ups and puts the sections of the
computed ideal sheaf into the *SCS* entries of the charts of the
covering of the final blowing up variety.