(setq ss (ssget "X" '((0 . "line")(8 . "beam"))))
(setq i 0)
(setq num (sslength ss))
(repeat num
(progn
(setq
ty (ssname ss i)
ent (entget ty)
pt10 (cdr (assoc 10 ent))
pt11 (cdr (assoc 11 ent))
)
(setq ssi (ssget "F" (list pt10 pt11) '((8 . "colu"))));
(if (and ssi (= (sslength ssi) 1))
(entdel ty)
)
(setq i (1+ i))
)
)
(princ)
)
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