S t 2t

S t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2tS t 2t