equation icon  2 @yy(x, 0) = k-5(2dr + 3dp), (277) 6 @yB(x, 0) = k25dp, (278) 2 @yC(x,0) = - k5-dp, (279) 2 k25- i @yR(x, 0) = - 6 dr- @i@ C(x,0), (280)