i vs r

i

character

  • The ninth letter of the English alphabet, called i and written in the Latin script. 

noun

  • The name of the Latin-script letter I/i. 

r

character

  • The eighteenth letter of the English alphabet, called ar and written in the Latin script. 

verb

  • are (in text messaging and internet conversations) 

How often have the words i and r occurred in a corpus of books? (source: Google Ngram Viewer )