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procedure TForm1.Button1Click(Sender: TObject);
var
a:Widestring;
begin
begin
a:='s';
ShowMessage(StringReplace(a,'s','',[]));
Edit1.Text:=a+'s';
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
a:Widestring;
begin
a:=VarToStrDef(a,'');
ShowMessage(a);
Edit1.Text:=a+'sss';
end;
procedure TForm1.Button1Click(Sender: TObject);
var
s:WideString;
begin
s:=StringOfChar(' ',1);
ShowMessage(s);
Edit1.Text:=s+'sss';
end;
procedure TForm1.Button1Click(Sender: TObject);
var
s:WideString;
begin
s:=StringOfChar(' ',1);
ShowMessage(s);
Edit1.Text:=s+'sss';
end;