Dear Siddhartha,

I'm not sure if this helps, but your group has maximal nilpotency class and those groups were classified by Blackburn (for p=3). Using the notation from [Parker-Semeraro, Fusion systems on maximal class 3-groups of rank two revisited] your group seems to be B(4;0,0,1).

Best wishes,
Benjamin

Am 14.07.20 um 22:18 schrieb Siddhartha Sarkar:
Dear Forum,

I am trying to get a bit more information about the origin of the group
SmallGroup(81,10) of order 81 in the small group library.

The gap command shows:

gap> StructureDescription(g);
"C3 . ((C3 x C3) : C3) = (C3 x C3) . (C3 x C3)"

>From the Fp-presentation with four generators it is not so easy to look at
it. Does the product come from an amalgam relation from a group of order
243?

Best regards,
Siddhartha
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