| http://www.w3.org/ns/prov#value | - You can sharpen a credit card to make a sharp implement.Aviation security consultant John L. Sullivan agreed with O'Brien, saying a pen or toothbrush can be sharpened like the "shivs" inmates sometimes make in prison.There are a lot of things you can use on an airplane if you are intent on hurting someone, said Sullivan, co-founder of the Welsh-Sullivan Group in Dallas.
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