The Find command is used to find a string of text in the source text of the
current program.

Syntax:

> Find [ First    ] ["string"]
       [ Last     ]
       [ Next     ]
       [ Previous ]

The First specifier indicates that the search is start at the beginning of
the program and proceed in the forward direction.  The Last specifier
indicates the opposite: start at the end and search backwards.  The Next
specifier starts at the location of the last find and moves forward, and
Previous moves backward.

The "string" argument is required for the first Find command. If not specified
on subsequent Find commands, the most recently specified value is used.

Find without any arguments is equivalent to Find Next.

Find with just the "string" operand is equivalent to Find First "string".

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