<PRE><B>Question 694159</B>
Watch these videos for substitution:

http://www.youtube.com/watch?v=S5ThT_qvL98

http://www.youtube.com/watch?v=oDSQVI7aZGM

http://www.youtube.com/watch?v=V7H1oUHXPkg

http://www.youtube.com/watch?v=-uX1R9Pd-WU

Watch these videos for elimination:

http://www.youtube.com/watch?v=awIMaSkY_g4

http://www.youtube.com/watch?v=nok99JOhcjo

http://www.youtube.com/watch?v=K9IG-aCHCSE

</PRE>