Two subnets with different mask on a single router?

router 1941
Hello. I'm needing assistance with the setup of two subnets within a single router.
Here's my information:
Router has only two GigabitEthernet interfaces.
GigabitEthernet0/0 has 172.20.0.1 ip and 255.255.252.0 mask.
GigabitEthernet0/1 has 172.21.0.1 ip and 255.255.128.0 mask
Now, on each side there is a Switch with two computers.
I need to have 1 computer on each side on the same subnet, and the other one on a different subnet, meaning a pc on the same side cannot communicate with the other computer on its side, but can with another computer on the other side.
I have no idea how to configure this on the router, can anyone please help me?
Thanks in advance!

>>> So you want PC1 and PC3 to be able to talk to each other but you don't want them to be able to >>>talk to PC2 and PC4 and vice versa.
This is correct.
>>>If so you don't need a router, you can just a switch (or switches) and use two vlans with no L3 >>>interfaces.
Unfortunately they are not giving me the choice of making my own net design. I need to setup this with all the devices mentioned (1 router, 2 switches, 4 pcs).
>>>If so you don't need a router, you can just a switch (or switches) and use two vlans with no L3 >>>interfaces.
As long as they communicate with the appropiate PC, it doesnt matter if they communicate to other devices or not.
Thanks again!

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Two subnets with different mask on a single router?

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