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(a) For side four of the polygon (shade region), the subsegment trajectory containing the starting and ending points λs and λe consists of two discontinuous segments (thick curves). (b) A continuous subsegment trajectory passing λs and λe can be formed for side four through including, e.g., an additional, straight subsegment trajectory connecting λs and λe. Again, denotes the direction of side four (dashed line) of the polygon.
