A method of etching or removing an amorphous carbon organic hardmask overlying a low dielectric constant film in a lithographic process. Each of the first and second prosthetic valve assemblies includes a balloon-expandable stent structure with a prosthetic valve secured therein. The memory cell array has a plurality of memory cells disposed at the intersections of the word and bit lines to form a matrix of rows and columns, wherein each memory cell comprises a resistive memory device and a transistor. Also disclosed are a computer-readable code for carrying out the method, a computer system that employs the code, and a vector generated by the method.