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Fortran mode assumes that you follow certain conventions that
simplify the task of understanding a Fortran program well enough to
indent it properly:
* Two nested `do' loops never share a `continue' statement.
* The same character appears in column 5 of all continuation lines.
It is the value of the variable `fortran-continuation-char'. By
default, this character is `$'.
If you fail to follow these conventions, the indentation commands may
indent some lines unaesthetically. However, a correct Fortran program
will retain its meaning when reindented even if the conventions are not
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