Is there an easy way of creating an ACL for denying users?

Hi All,
I like to create an ACL that would prevent about 50 users from accessing a particular network in our MPLS network. I do not want to create another vlan for this.
Let's say I want to deny this range 10.12.16.20 - 50 from accessing 10.3.0.0 network but allow then access to everthing else. Is this how to do it?
Access-list 101 deny 10.12.16.20 0.0.0.0 10.3.0.0 0.0.255.255
Access-list 101 deny 10.12.16.21 0.0.0.0 10.3.0.0 0.0.255.255
Access-list 101 deny 10.12.16.22 0.0.0.0 10.3.0.0 0.0.255.255
-- this will go continue down to .50
Access-list 101 permit ip any any
Can I do something like this?
Access-list 101 deny 10.12.16.20 - 50 0.0.0.0 10.3.0.0 0.0.255.255
Access-list 101 permit any any
Thanks

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What Karsten has suggested, would be the "cleanest" approach, but if the IOS doesn't support it, what Rick suggested would be the way to do it using the fewest ACEs.
If using Rick's approach, as he mentioned you can set ACEs on binary boundaries, variations on the "theme" might be to include a bigger block than needed, if the overage isn't harmful. For example, when trying to exclude hosts 20 .. 50 one ACE could block 0 .. 63.
Also remember you can mix permits and denies. So say you wanted to block just 8 .. 63, you could permit 0..7, block 0..63 and then permit any. Depending on your requirement, mixing permits and denies might require the fewest ACEs in your ACL.
Of course the disadvange of a complicated ACL, it's harder to understand. However, on a sofware based router, the shorter ACL might perform better.

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Is there an easy way of creating an ACL for denying users?

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