Car Josu
Secundo le IED (Interlingua-English Dictionary) proque e perque son
synonimos, absolutemente identic:
proque
pro·que
adv/conj 1. why (= for what reason); 2. because
perque
per·que
adv/conj 1. why (= for what reason); 2. because
Péter Kovács
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