Corrigendum for
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D. Ahman, T. Uustalu. Directed containers as categories.
In R. Atkey, N. Krishnaswami, eds., Proc. of MSFP 2016, v. 207 of EPTCS,
pp. 89-98. Open Publishing Assoc., 2016. doi:10.4204/eptcs.207.5
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p 97, l 10 from bottom: The parenthetical remark "as is any category
with one object" should read "as is any category with one object and
commutative composition, i.e., any commutative monoid seen as a
category".