Grey<br>I went to the store to buy a new phone. The one I wanted was available. The salesperson showed me three different colors. I had a hard time choosing. I finally decided on the grey model.
They bought the grey model, but didn't deliberate for very long. 
From the context we can see that they did deliberate for a while because it states they had a hard time choosing. The system likely could not equate hard time choosing with a long deliberation. 
( z1 contrast :ARG1 ( z2 buy :ARG0 ( z3 they ) :ARG1 ( z4 model :ARG1-of ( z5 gray ) ) ) :ARG2 ( z6 deliberate :polarity - :ARG0 z3 :ARG1 z2 :ARG1-of ( z7 long :degree ( z8 very ) ) ) )