Tell or Say, please, what sizes of a basin are considered normal? Whether narrow...

[Elena]

Tell or Say, please, what sizes of a basin are considered normal? Whether a narrow basin at me (DSp 22, DCr 26, Dtroch 30, Cext 20)?

[Oshchepkova S.R.]

The sizes of a normal basin: 26 (26) - 28 (29) - 30 (31) - 20. At you a narrow basin.