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rock steady
rock-steady
rock wallaby
rock wool
rock wren
rockabilly
rockabye
rockaway
rockbound
rockcrawler
rocker
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rocket science
rock·et sci·ence


noun 
Definition:
 
complex activity: a complex and intellectually demanding activity ( informal )
Using the Internet isn't exactly rocket science.
[Late 20th century. Because the province of a few highly qualified specialists]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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