Director Zhang is sorting the last three shows of the party, and the adjacent programs cannot belong to the same genre. Director Zhang has to choose from three skit shows, three-song shows, and three dance shows. For three programs, Which of the following conditions must be met: if the first program is a skit, the second program is a dance, if the second program is a song, then the first program is a dance, and the third program is a skit or a dance. The second show is a song. Which of the following is the possible sequence of the program? ['Program one: sketch program two: dance program three: dance.', 'Program one: sketch program two: song program three: dance.', 'Program 1: Song Program 2: Essay Program 3: Dance.', 'Program one: Dance program two: Sketch program three: Songs.']