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rearranging symbolic variables
 To: mathgroup at smc.vnet.net
 Subject: [mg128315] rearranging symbolic variables
 From: yajnaval at gmail.com
 Date: Sat, 6 Oct 2012 01:51:32 0400 (EDT)
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I have a group of symbolic variables that look like this
phi_1.phi_3.phi_1.phi_2 + phi_2.phi_1.phi_1.phi1 + .....
Need to rearrange the above expression such that all the (phi_1)s are on the left and all (phi_2)s are to right side of (phi_1)s but to the left of (phi_3)s i.e. REWRITE the above as
phi_1.phi_1.phi_2.phi_3 + phi_1.phi_1.phi_1.phi_2 + ....
The dots may not be necessarily multiplication, they may be just strings with a certain combination of (phi_1)s and (phi_2)s in a certain order, to be ordered in a given way.
Any help is appreciated.
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