
Olá, Carlos,
De acordo com as referências que encontrei, "por favor" deve vir sempre seguido ou precedido de vírgula.
http://www.paulohernandes.pro.b...1/dica111.html
http://www.ciberduvidas.com/pergunta.php?id=18280
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This sentence was initially added as a translation of sentence #2961532
added by carlosalberto, January 3, 2014
linked by carlosalberto, January 3, 2014
edited by carlosalberto, January 5, 2014
linked by Horus, January 20, 2015