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rockered wheels
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rocking stone
rock·ing stone (plural rock·ing stones)


noun 
Definition:
 
U.K. boulder balanced so it can rock: a large stone or boulder that is so finely balanced, e.g. on another stone or stones, that it can be made to rock backward and forward with little effort
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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