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function lowcase(s: string): string;

 
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A simple function that converts alphabetic values into their respective lowercase value.

function lowcase(s: string): string;
var
  i: integer;
begin
  s := upcase(s);

  for i := 1 to length(s) do
  begin
    if s[i] in ['A'..'z'] then // this is to check that s[i] is alphabetic
    begin
      s[i] := chr(ord(s[i]) + 32); // convert s[i] to a numeric value, then + 32 to it, and convert the final numeric value into a char
    end;
  end;
  lowcase := s;
end;
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