A filter that seems to work with the above plan is to only back the selections with exposed form of.
121,131,141,151,161,171,181,191,101.

1) TAB Nos. 2-5 only (it dies in the butt if No.1 is backed)

2) $4.20-12.00 in the prepost market.
( a % loss is created if backing mules under this vaue.)

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Cheers.