High symmetry directions in a two-dimensional oblique crystal

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What are the high symmetry directions for a two-dimensional oblique crystal? Please provide a figure of the corresponding Brillouin zone with high symmetry points labelled.
 
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One 2D oblique crystal is like any other 2D oblique crystal. No examples will be particularly useful. I asked because I couldn't find any books giving the answer. Most limit themselves to hexagonal or square crystals but skip the oblique one.