Final answer:
The appropriate phrase to fill in the blank is 'a la derecha', which means 'to the right' in Spanish.
Step-by-step explanation:
The appropriate phrase to fill in the blank is a la derecha, which means 'to the right' in Spanish. This phrase indicates the direction of the station in relation to the library. For example, if the library is on your left, the station is to the right.
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