RC - 9base - revived minimalist port of Plan 9 userland to Unix
 (HTM) git clone git://git.suckless.org/9base
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       RC (215B)
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            1 /build_RC {
            2     pop
            3     size 4 div /side exch def
            4     currentpoint
            5     newpath
            6     moveto
            7     0 side 1.5 mul rmoveto
            8     0 side rlineto
            9     side 2.5 mul 0 rlineto
           10     0 side neg rlineto
           11     closepath
           12     fill
           13 } def