groups command shows user in group users while it is not

[Hennie]

I have installed cygwin on a slihghtly in XPhome

i created a user foo in xphome and trew the account OUT of the group users
with the command net localgroup users foo /DEL

the command net user foo does therefore show the user foo not to be anymore in 
the group users
Full Name foo
... stuff left away.....
Local Group Memberships      *gast                 *SshAllow
Global Group memberships     *None
The command completed succesfully

i have installed sshd and login via an ssh client to cygwin as user foo

i give the command groups

i see 

$ groups
gast None Users SshAllow


Question.... 
1. How come i see the user is still in the group Users ?
2. Is there a way to get the user foo OUT of the group Users ?






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