| The optional argument tr=tailred determines whether tail reduction will be performed.
- If (tailred=0), no tail reduction is performed,
- If (tailred<>0), tail reduction is performed.
The other optional argument meth determines which method is
used for Groebner basis computations.
- If mt=0 (default), the procedure std is used.
- If mt=1, the procedure slimgb is used.
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