1 03/10/76   edit prefix, edit pre
 2 
 3 Function:  inserts a given character string immediately before each
 4 occurrence of an existing string.
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 6 
 7 Syntax:  edit prefix /old_string/new_string/line1{ line2 ... lineN}
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 9 
10 Arguments:
11 /  string delimiter.
12 old_string  string to be located.
13 new_string  string to be inserted.
14 linei  line number or range of lines within which substitution occurs.