Os yw'n wirioneddol gydamserol, yna dylai fod rhwymiad dwbl; ni ddylai'r Ysgrifennydd Gwladol allu newid y darpariaethau hyn heb eich cytundeb chi chwaith.
If it's truly concurrent, then there should be a double bind; the Secretary of State should not be able to change these provisions without your agreement either.
C1