Sentence 1: Sam carried a two-headed coin he used to con people. 
 Sentence 3: He won on the first coin toss, then offered to double the bet 
 Sentence 4:  When he tossed the coin, it rolled and fell through a grate 
 Sentence 5:  The 'mark' reached in his pocket for another coin to toss 
 Given Sentence 2: She really needed the prize money for college.