In article 8f2b38a3-49ef-4fed-9415-2b16b11884e8
@g23g2000vbr.googlegroups.com, says...

If it is hard to distinguish between the two, then block or ignore
both. That would allow the twins to throw sand in each others faces
with no interruption.

I'm sure they would enjoy and appreciate the extra room in the litter
box.

I think they are all Harry, after all, everyone was/is ignoring him and
he needed a way to get around filters, at least for a while...

Just block any of his sockpuppets, it's easier that way. I noticed he
has been sneaking through lately, but we are all catching on.