In designer itself you can check for the logical operations
For example once you added a condition later you can select that particular and apply your logical operations using if conditions.
There are built in options available for the same in the designer ribbon.
Check this support link, this link will guide you through applying different conditions in the workflow and also it will help you knowing which links are available at which step.
You can do the logical operations like :
Click Conditions dropdown and choose "Compare [list] field"
Click field and value to set those, then
Click Conditions dropdown again and choose "Compare [list] field"
Click and to change it to or, then
Click field and value again to set those to your second choice