Martin,

> The patch by Kwankyu Lee seems to allow that, i.e. you can give a Singular
> string an pass force=True, which *should* pass it through to Singular.

Sorry, I never before knew that sage has a patching mechanism.  I did
give it a try, and verified that the patch was indeed installed and
rebuilt.  Unfortunately, it doesn't clear up my problem.  My
impression is that force = True causes sage to pass the string along
to Singular if something goes wrong in the parsing process, but does
not short-circuit the parsing itself.

It turns out the Singular "dp" order is an example of the kind of
order I need, and of course "dp" gets passed from Sage to Singular
unmolested.  This means I can make some immediate progress, and
postpone looking at other orders for the moment.  Thanks for all your
help.

Jeff

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