an vs into

an

prep
  • In each; to or for each; per. 

article
  • Used before one and words with initial u, eu. 

  • Used before a vowel sound. 

  • Used before all consonants. 

  • Used before /h/ in an unstressed syllable. 

  • Used before /h/ in a stressed syllable. 

num
  • one 

noun
  • The first letter of the Georgian alphabet, ა (Mkhedruli), Ⴀ (Asomtavruli) or ⴀ (Nuskhuri). 

into

prep
  • To or towards the inside of. 

  • After the start of. 

  • Interested in or attracted to. 

  • Against, especially with force or violence. 

  • Investigating the subject (of). 

  • Expressing the operation of division, with the denominator given first. Usually with "goes". 

  • Indicates transition into another form or substance. 

  • To or towards the region of. 

  • Indicates division or the creation of subgroups or sections. 

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