Most hospitals have treatment options for cancer patients  All hospitals are able to treat all kinds of burn victims as well as all kinds of Neurology disorders
Ttherefore, there must be some hospitals that treat both cancer and burn victims and some hospitals that treat both cancer and Neurology disorders
Most insects are helpful to humans. Nearly all insects have an exoskeleton and a body made up of three parts: a head, thorax, and abdomen. Ttherefore, unless there are some insects that are both helpful to humans and have an exoskeleton, there must be some insects that are both helpful to humans and are made up of three parts.