t_b_x - plan9port - [fork] Plan 9 from user space
 (HTM) git clone git://src.adamsgaard.dk/plan9port
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 (DIR) LICENSE
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       t_b_x (180B)
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            1 /build_bx {
            2     pop
            3     size 2 div /side exch def
            4     currentpoint
            5     newpath
            6     moveto
            7     0 side rlineto
            8     side 0 rlineto
            9     0 side neg rlineto
           10     closepath
           11     fill
           12 } def