Assertion: melanoma's skin | /r/HasAspect | several layers
Facets:
Source sentences:
text: The skin has several layers, but the two main layers are the epidermis (the upper or outer layer) and the dermis (the lower or inner layer).
text: The skin has several layers, but the two main layers are the upper layer, called the epidermis, and the lower or inner layer, called the dermis.