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# None -- an option for DExt=>Special

## See also

- DExt -- Ext groups between holonomic modules

## For the programmer

The object None is a symbol.

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/BernsteinSato/DOC/DHom.m2:66:0.