sia (determiner):
allebei(en) each of two; one and the other., allebeide(en) each of two; one and the other., alletwee(en) each of two; one and the other., beide(en) each of two; one and the other., beiden(en) each of two; one and the other.
sia (vw):
zowel ... als ...(en) both...and....
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