Chance of hitting gutshot or better with SCs

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What is the chance to hit a gutshot or better when you hold a SC wiht no gaps, ie: T [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/spade.gif[/img], 6 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/heart.gif[/img]

Basically any hand on the flop that has 4 outs or more against an overpair.

Some examples:

a) You hold 8 [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/spade.gif[/img], flop comes 6 [img]/images/graemlins/heart.gif[/img]5 [img]/images/graemlins/diamond.gif[/img]2 [img]/images/graemlins/spade.gif[/img]
b) You hold 4 [img]/images/graemlins/diamond.gif[/img]5 [img]/images/graemlins/diamond.gif[/img], flop comes T [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/club.gif[/img]2 [img]/images/graemlins/diamond.gif[/img]
c) You hold T [img]/images/graemlins/club.gif[/img]9 [img]/images/graemlins/club.gif[/img], flop comes 8 [img]/images/graemlins/club.gif[/img]7 [img]/images/graemlins/diamond.gif[/img]3 [img]/images/graemlins/club.gif[/img]