en  - in, on, at 

a  - to, in the manner of, on, by means of, per, each, at 

por  - for, during, as for, times, from, according to, as, for, by 

de  - of, from, in, at, than 

para  - for, to, towards, to, in order to, around, by (a time) 

astatina

arroba