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(emacs-lisp-intro.info)Similarities differences

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Similarities and differences
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   The `print-X-axis' function is constructed in more or less the same
fashion as the `print-Y-axis' function except that it has two lines:
the line of tic marks and the numbers.  We will write a separate
function to print each line and then combine them within the
`print-X-axis' function.

   This is a three step process:

  1. Write a function to print the X axis tic marks,
     `print-X-axis-tic-line'.

  2. Write a function to print the X numbers,
     `print-X-axis-numbered-line'.

  3. Write a function to print both lines, the `print-X-axis' function,
     using `print-X-axis-tic-line' and `print-X-axis-numbered-line'.