Cutting elements are provided having substrates including end surfaces. The polychloroprene latex is prepared by polymerization of 2-chloro-1,3-butadiene alone or by polymerization of raw monomers at least containing 2 -chloro-1,3-butadiene and 2,3-dichloro 1,3-butadiene and has a precipitation rate of 5 to 40%, as calculated according to Equation. The reader is configured to receive a first signal from a first position relative to the storage medium and read a second signal from a second position relative to the storage medium. The structural condition rewriting unit is configured to rewrite the structural condition into a rewritten query when a type of the structural condition is other than a descendant structural condition. Other embodiments provide an organic light-emitting diode device comprising a compound of Formula I. A computing device computes the distance to the measurement target and the speed of the measurement target from the minimum and maximum oscillation wavelengths of the first and second semiconductor lasers and the count result obtained by the counting unit.