Free Hero Mesh

  Edit a macro. This changes the first token of the definition of the macro
  (which must not be another macro) to the specified token (which also must
  not be another macro). The token is expanded, and must be a single token
  once it is expanded; that is what it will be replaced with.

{include <string>}
  Include text from another file into this one. You cannot use {include}
  inside of another macro or in a macro argument. The file must be in the
  current directory, and its name must contain only letters, digits, dot,
  underscore, and minus signs, and must start with a letter or digit. If
  it is a composite puzzle set, then the name must end with ".include",
  and is looked for first inside of the composite puzzle set; if it is not
  found there then it is looked for in the current directory.

{make <mode> <arg>}
  Make a synthetic token; see the below section about synthetic tokens for
  details. The second argument can be a number, or a direction or key name
  which is treated as a number, or a string. In most cases, a number will
  be converted to a string with its unsigned decimal representation.