than top-down or bottom-up "chunking", or than subsectioning. Donald Knuth said that when he realized this, he began to think of a program as a web of various parts.

Order of human logic, not that of the compiler

In a noweb literate program besides the free order of their exposition, the chunks behind macros, once introduced with <<...>>=, can be grown later in any place in the file by simply writing <<name of the chunk>>= and adding more content to it, as the following snippet

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