@pimms.value<EOL><INDENT>def outer_border_triangles(all_border_triangles):<DEDENT>
if pimms.is_map(all_border_triangles):<EOL><INDENT>return pimms.lazy_map({k:curry(lambda k:all_border_triangles[k][<NUM_LIT:1>], k)<EOL>for k in six.iterkeys(all_border_triangles)})<EOL><DEDENT>else: return all_border_triangles[<NUM_LIT:1>]<EOL>
path.outer_border_triangles contains the coordinates of the outer partial-face triangles
that lie on the boundary of the given path; if the path is not closed, these correspond to
the right parts of the intersected faces. See also border_triangles and
all_border_triangles.