These four solutions had strong similarities-importantly, not in the solutions themselves. Models work when they provide understandable bases for reasonable decisions. All four solutions met that criterion and several others: 1. They were presented clearly. 1.1 The descriptive text was clear. There were comparatively few errors in grammar, vocabulary, or style; and these didn't interfere with the reader's understanding. 1.2 Graphics were appropriate and clear. They supported the argument being made. The appropriate text referred to them.
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