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function StrToSlip (const a: String): String;
var
    i, l: Integer;
    b: String;
begin
    l:= length(a);
    b:='';
    for i:=1 to l do
    begin
        case ord(a[i]) of
          192: b:= b + #219#220;
          219: b:= b + #219#221;
          else b:= b + a[i];
        end;
    end;
    result:= b;
end;

function SlipToStr (const a: String): String;
var
    i, l: Integer;
    b: String;
    jump: boolean;
begin
    l:= length(a);
    b:='';
    jump:= false;
    for i:=1 to l do
    begin
        if not jump then
        begin
            case ord(a[i]) of
              219:  begin
                        case ord(a[i+1]) of
                          220:  begin
                                    jump:= true;
                                    b:= b + #192;
                                end;
                          221:  begin
                                    jump:= true;
                                    b:= b + #219;
                                end;
                          else b:= b + a[i]; //Protokollverletzung entdeckt, nichts tun.
                        end;
                    end;
              else  b:= b + a[i];
            end;
        end else
        jump:= false;
    end;
    result:= b;
end;