“Some of the words stored in the memory represent data to be operated upon, like numbers and letters. Others represent instructions that tell the machine what sequence of operations to perform. The instructions are stored in machine language, which, as noted, is much simpler than a typical programming language. Machine language is interpreted directly by the finite-state machine. In the type of computer we will describe, each instruction in machine language is stored in a single word of memory, and a sequence of instructions is stored in a block of sequentially numbered memory locations.”