Premise: It took the sculptors Jean de Marville, Claus Sluter, and Claus de Werve 26 years (from 1385 to 1411) to complete the intricate marble and alabaster sculptures for the extravagant mausoleum of Philippe le Hardi.

Hypothesis: The three sculptors who made the artwork for the mausoleum of Phillipe le Hardi worked together every single day for 26 years. 
Relation: neutral