Assertion: bell tower's bell | /r/HasProperty | 1×2×3×4×5×6 = 720 changes
Facets:
Source sentences:
text: The plain bob pattern can be extended beyond the constraints of the plain course of 60 changes, to the full unique 720 changes possible (this is 6 factorial on 6 bells, which is 1×2×3×4×5×6 = 720 changes).