Code:
root@bnesrv50 # getent group | grep -i A
A:*:2560:a9ad3059,a9an2462,a9ap2447,a9cb2519,a9dm3678,a9es5342,a9jc2364,a9jd3062,a9jl1987,a9lz6481,a9nh4814,a9nm2713,a9rs2507,a9wa2556,ah1901,alastair,at2tha,bryans,c9dg2497,c9fl6347,c9pm2994,c9rc2865,cw2659,dennism,dr2551,eliza,fg2287,ge1700,gkelly,ja2406,jdowling,jkennedy,mf3525,mw2955,petewil,philob,pv2571,rakesh,rg4365,rj2619,rv3526,sl3353,sorcha,t9ar4510,t9ds4473,t9ga4650,t9jg2677,t9kk4511,t9km3147,t9lp4607,t9mt4512,t9ng4556,t9ns4681,t9ra4517,t9rb4551,t9rk4550,t9rs4518,t9rs4519,t9rs4687,t9rv4688,t9sk4509,t9sn4558,t9tk5064,t9tl2850
root@bnesrv50 # getent group | grep -i B
B:*:2560:a9ad3059,a9an2462,a9ap2447,a9cb2519,a9dm3678,a9es5342,a9jc2364,a9jd3062,a9jl1987,a9lz6481,a9nh4814,a9nm2713,a9rs2507,a9wa2556,ah1901,alastair,at2tha,bryans,c9dg2497,c9fl6347,c9pm2994,c9rc2865,cw2659,dennism,dr2551,eliza,fg2287,ge1700,gkelly,ja2406,jdowling,jkennedy,mf3525,mw2955,petewil,philob,pv2571,rakesh,rg4365,rj2619,rv3526,sl3353,sorcha,t9ar4510,t9ds4473,t9ga4650,t9jg2677,t9kk4511,t9km3147,t9lp4607,t9mt4512,t9ng4556,t9ns4681,t9ra4517,t9rb4551,t9rk4550,t9rs4518,t9rs4519,t9rs4687,t9rv4688,t9sk4509,t9sn4558,t9tk5064,t9tl2850