the difference between the birth days of my sisters and me - as the number of the day in the month - is the same than the difference in years between us.
My older sister was born on 29 (august), i was born on 25 (feb), my younger sister was born on 19 (apr). 29-25=4 (that's the difference in years between me and the older), 25-19=6 (that's the difference in years between me and the younger).
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