Bedroom four has two twin beds and the fifth bedroom has two sets of twin bunk beds - both have flat screen televisions. (wyndhamvacationrentals.com)
After she gave birth to her second set of twins in two years, her insomnia gradually got worse. (health.com)
It's important to remember that all numbers are derived from dozens or hundreds of sets of twins and do not describe any one individual. (discovermagazine.com)