Lunch with friends<br>Amy and Nora went to the new Mexican place for lunch. They both ordered giant Margaritas and chips and salsa. Amy enjoyed a burrito and Nora had delicious fish tacos. While they were eating, a mariachi band came to their table. Before they left, they tipped the band because they were so good.
 Amy and Nora tipped the waiter.
not clear if the tipped the waiter.
( z1 tip :ARG0 ( z2 and :op ( z3 person :name ( z4 name :op "Amy" ) ) :op ( z5 person :name ( z6 name :op "Nora" ) ) ) :ARG2 ( z7 person :ARG0-of ( z8 have-rel-role :ARG2 ( z9 waiter ) ) ) )