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ACROSS
1)  the dull explosive noise made by an engine
2)  a small constellation in the northern hemisphere near cygnus and draco; contains the star vega
3)  german industrialist who was the first in germany to use an assembly line in manufacturing automobiles (1871-1948)
4)  a deep prolonged sound (as of thunder or large bells)


DOWN
1)  the sound of a horse's hoofs hitting on a hard surface
2)  blatant or sensational promotion
3)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
4)  an open sore on the back of a horse caused by ill-fitting or badly adjusted saddle

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