begin vs open its doors

begin

verb
  • To start, to initiate or take the first step into something. 

  • To come into existence. 

  • To be in the first stage of some situation 

noun
  • Beginning; start. 

open its doors

verb
  • To begin operating. 

  • To allow or invite outside influence, investment or immigration. 

How often have the words begin and open its doors occurred in a corpus of books? (source: Google Ngram Viewer )