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This paper aims to provide evidence for the symmetries of edges by investigating stress patterns of the languages that require either both edges be demarcated at the same time or both avoid edge-demarcation altogether. Simultaneous demarcation of both the beginning and ending of a word by metrical prominence is found from the stress patterns of Gugu-Yalanji and Auca, and simultaneous avoidance of edge-demarcation at both edges is supported by the stress pattern in Asheninca. I show that the alignment constraints referring to the left and right edges behave as a group in the constraint hierarchy in both cases and argue that they cannot be captured using local conjunction of constraints. The reason that they behave as a group in constraint hierarchy is not an accident, and it should be formally captured in grammar. I propose EDGE-HIGHLIGHT and EDGE-AVOIDANCE as edge-symmetric constraints, and show that the proposed analysis obviates the need to posit separate levels to account for stress patterns.
