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Use "back-ups" in a sentence
"Local roads such as Georgia Avenue and Norbeck Road, where residents say they are concerned about back-ups from ICC traffic trying to enter and leave the highway, had no significant problems as of 7 a.m."
"Glad that Swierczynski is at least doing back-ups in the Immortal Weapons mini."
"They said the main feature will be 22 pages with 10 page back-ups, at least for Metal Men."