Sentence 1: Sam was at the office supply store to buy pens for himself. 
 Sentence 3: He decided to buy a set of 20 gel pens that were blue 
 Sentence 4:  At the register he paid with his credit card 
 Sentence 5:  To sign the receipt he used one of his new pens 
 Option 1: Sam didn't find any pens there. 
 Option 2: He tried out all the pens on display to see how they felt.