Cirbad kasta, iyada oo aan loo eegin inay tahay xirfad-yaqaanno xirfadeed ama mid mideysan, ama hiwaayad si ay wax uga qabtaan wax aan caadi ahayn, gacmihiisa, waxay ku dhacdaa qalab kala duwan, qalabyo iyo waxyaabo yaryar oo lagama maarmaan u ah shaqada. Waxaa jirta baahi loo qabo in la abaabulo booska shaqada hab aan kaliya ahayn in aan loo lumin dhammaan noocyada "baahida", laakiin waqti kasta oo la ogaado haddii loo baahdo. Tani waa gaar ahaan run ahaanta cirbadaha iyo bollaas oo "ku yaal" meelaha ugu fileysa. Dhererka kaydinta waxay si fiican ugu habboon tahay cirbado kala duwan oo sahlan oo lagu sameeyo gacmahooda.
