conveniently vs standing on one's head

conveniently

adv
  • In a convenient manner, form, or situation; without difficulty. 

  • In a manner provoking suspicion due to how well it suits someone's purposes. 

standing on one's head

adv
  • Very easily. 

How often have the words conveniently and standing on one's head occurred in a corpus of books? (source: Google Ngram Viewer )