Sr ham to beech men sira nhi chorte ek hi tarteeb men le k jate hain jo sira apne c2 bnaya ham ise B1 bnate hai or chahe wo 12 sat wali ho chahe wo 6 sat wali ho or ham ranning istarting men bhi dalte hain 3 uper 3 neeche us men bhi yhi krte hain jo apne beech men sirra chorne ka bola wo nhi chorte use B1 bnate hain