Authors of a study may scratch a head.Logical formLearned from1 sentences. (Voice patterns) may be scratched.Logical formLearned from1 sentences. A (business associate) may scratch for an anecdote.Logical formLearned from1 sentences. An undercover operation may be scratched.Logical formLearned from1 sentences. Some stars may scratch backs.Logical formLearned from1 sentences. Hens may be scratched in dirt.Logical formLearned from1 sentences. Everybody may scratch a back.Logical formLearned from1 sentences. An afflicted may scratch hard.Logical formLearned from1 sentences. A general may scratch.Logical formLearned from1 sentences. Cosmologists may scratch heads.Logical formLearned from1 sentences. (Invasion plans) may be scratched by a president.Logical formLearned from1 sentences. Some tunes may scratch a surface of an oeuvre.Logical formLearned from1 sentences. An image may scratch.Logical formLearned from1 sentences. Research may scratch a surface of a problem.Logical formLearned from1 sentences. An executive may scratch himself.Logical formLearned from1 sentences.