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From Latin "per annum"= by year or yearly
The expression "who had come to beg favor" is a relative clause. Specifically, it is a past perfect relative clause because it describes the action of someone who had come to beg favor in the past. In this construction, "who" is the relative pronoun that introduces the clause, and "had come" is the past perfect verb phrase.
You convert an (infix) expression into a postfix expression as part of the process of generating code to evaluate that expression.
Parenthesis, Exponents, Multiplication or Division(whichever come first from left to right*), Addition or Subtraction *
it is an expression