Question: How to write a PDE-BVP

I tried to solve a PDE-BVP :

D[epsilon]*diff(C[a](z,t),z,z$2)-(lambda)*R*K-S=0;

BC C[a](0,t)=C, (d(C[a])/dz)(z=-z0)=0;

Request to guide me how to write maple code for Boundary conditions.

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