| http://www.w3.org/ns/prov#value | - In some embodiments, a mirror includes a non-circular opening that has a maximum dimension of about 50 mm or less (e.g., about 45 mm or less, about 40 mm or less, about 35 mm or less, about 30 mm or less, about 25 mm or less, about 20 mm or less, about 15 mm or less, about 10 mm or less, such as about 5 mm).
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