Code:
netgroup1 (-,user1,one2one.co.uk)\
(-,user1,t-mobile.co.uk)\
(-,user2,one2one.co.uk)\
(-,user2,t-mobile.co.uk)\
(-,user3,one2one.co.uk)\
(-,user3,t-mobile.co.uk)
netgroup2 (-,user4,one2one.co.uk)\
(-,user4,t-mobile.co.uk)\
(-,user5,one2one.co.uk)\
(-,user5,t-mobile.co.uk)\
(-,user6,one2one.co.uk)\
(-,user6,t-mobile.co.uk)
netgroup3 (-,user7,one2one.co.uk)\
(-,user7,t-mobile.co.uk)\
(-,user8,one2one.co.uk)\
(-,user8,t-mobile.co.uk)\
(-,user9,one2one.co.uk)\
(-,user9,t-mobile.co.uk)