A Jam Producer is someone who creates jams, jellies, and preserves. A BOTTLENECK is a situation in which progress or development is impeded due to a lack of resources or personnel. A COMBO is a small musical group, usually with a piano, guitar, and drums. A Pileup is a situation in which multiple vehicles crash into each other. TRAFFIC is the movement of people or goods from one place to another. A COPIER is a device used to make copies of documents.