ENLACES A DISEÑO PARAMÉTRICO

http://www.youtube.com/watch?v=87Rp8rRKnKE&feature=related

http://www.youtube.com/watch?v=87Rp8rRKnKE&feature=fvwrel

http://www.youtube.com/watch?v=ejyLOSN4XQY&feature=related


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http://www.youtube.com/watch?v=lMGzbwCvQ24&feature=related
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http://www.youtube.com/watch?v=fdq7mxqByig&NR=1&feature=fvwp