Four buses $$B_1, B_2, B_3, B_4,$$ depart from the station $$S_1$$, and arrive the stations $$S_2$$, and $$S_3$$,. The bus numbers and the order in which they depart or arrive is not the same. The first bus to leave $$S_1$$, is the second to reach $$S_3$$, and the third to reach $$S_2$$. The first bus to reach $$S_3$$, is the second bus to leave $$S_1$$, and the last bus to reach $$S_2$$.
Based on this information answerthe following questions.