Assertion: bobby pin | /r/CapableOf | be prone to slip out of place endwise
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Source sentences:
text: Bobby pins in common use are of the general form of a U and hence are prone to slip out of place endwise, whereas the double bobby pin of this invention will not easily slip out of place because it comprises in eiect two opposed U- shaped bobby pins both having one arm of its U in common and because the hair is engaged in both of the Us thereof.