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ArticleHeubach, SilviaWe consider tilings of 2 × n, 3 × n, and 4 × n boards with 1 × 1 squares and L-shaped tiles covering an area of three square units, which can be used in four different orientations. For the 2 × n board, the recurrence relation for the number of tiling . . .
ArticleDiscrimination of Solid from Liquid Precipitation over Northern Enrasia Using Surface Atmospheric ConditionsYe, HengchunDaily synoptic observations were examined to determine the critical air temperatures and dewpoints that separate solid versus liquid precipitation for the fall and spring seasons at 547 stations over northern Eurasia. The authors found that critical a . . .