Assertion: piper's sister | /r/HasProperty | only
Facets:
Source sentences:
text: Piper is the only sister to never have possessed the power of Premonition.
text: Following Prue's death, Piper was the only sister with offensive power, until Phoebe developed and advanced form of Empathy.
text: Piper is the only sister to be transformed into a Goddess thrice;
text: Piper is the only sister whose powers are an advanced version of her past life's.