Assertion: moped's engine | /r/HasProperty | bolted to the frame
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Source sentences:
text: There are 3 distinct variations amongst modern 2-wheelers - step-over machines (all of these are motorcycles), under-bone machines with engines bolted to the frame (some with small wheels and refered to as scooters, but including big-wheeled Honda Cub-style step-through motorcycles) and under-bone scooters with Vespa-style pivoting engines (including maxi-scooters).