$ ls freq

westudio facebook github linkedin pocket reddit tric

$ ls cse

cass ccp-e comp2011 comp2012 comp2021 comp2611 comp4900 engg-adv imagine@cse

$ ls dev

cssahk.admin darwin.iso freenom hkciea.admin icons8 imagine msdb msss.admin vmware-unlocker

$ ls school

canvas course library my_portal mystudyaborad pathfdr redbird student_center turnitin ust.space