Instruct: Classify the given Amazon review as either positive or negative.
Query: Tangrams are great, unfortunately only got four colors

I teach middle school math. Tangrams are great for many, many objectives. I specifically ordered the six colors because there were purple tangrams in the set and 12 year-olds love purple. Unfortunately, all three sets were the four color sets. No purple. They still work, and I still love tangrams, but I'm really disappointed about the lack of purple. If the robot had pulled the correct bucket off the shelf, this would be a five-star review.