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This topic (also started by the OP) deals with similar issues and should be of interest:http://www.theswamp.org/index.php?topic=50075.0
(setq D (angtos (angle A B)))
(setq D (angtos (angle B A)))
(if (< (car A1)(car B1)) (setq inicio B1) (setq inicio A1))
(setq inicio A1)