This sentence is saying "the sister of my sister is my..."
You sister's sister would be your sister (hermana)
so
<span>La hermana de mi hermana es mi hermana</span>
Spain. has 2 cities with more than a million people, 88 cities with between 100,000 and 1 million people, and 768 cities with between 10,000 and 100,000 people. The largest city in Spain is Madrid , with a population of 3,255,944 people. 80%
¿Ensayo de qué? Tienes que especificar para que se pueda hacer un ensayo.