pie-labels
A = (Exp 1::Exp 2::Exp 3::Exp 4)
B = (Exp 1::Exp 2::Exp 3::Exp 4)
C = (Exp 1::Exp 2::Exp 3::Exp 4)
D = (Exp 1::Exp 2::Exp 3::Exp 4)