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(defun c:show()
(setq ss (ssget "x"))
(if ss
(progn
(setq i 0)
(repeat (sslength ss)
(setq obj (vlax-ename->vla-object (ssname ss i))
i (1+ i))
(if (equal :vlax-false (vlax-get-property obj 'Visible))
(vlax-put-property obj 'Visible :vlax-true)))))
(princ)
)
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(defun c:hidden()
(setq ss(ssget)
i 0)
(repeat (sslength ss)
(setq en (ssname ss i)
i (1+ i))
(vlax-put-property (vlax-ename->vla-object en) 'Visible :vlax-false))
(princ)
)