Shortcut method to find atomic term symbols ignoring the spin orbit coupling

Is there any shortcut method by which we can find the atomic term symbols ignoring the spin-orbit coupling, i.e. ignoring the values of J. 


For instance, when writing the d-d transitions for any complex, we write the atomic term symbols and them split them further into other states. I know the lengthy procedure to find the term symbols by considering the values of Ml, and finding the exact states including the spin-orbit coupling but is there a shortcut way by which we may find the atomic term symbols?
[![Correlation diagram for d2 configuration](https://i.stack.imgur.com/11MFt.png)](https://i.stack.imgur.com/11MFt.png)


Like, in the above picture, how did we find the terms for d2 to be 1S, 1G, 3P, 1D, and 3F




After searching on the internet, and going through textbooks, I understand there is no "shortcut-method" to get the atomic term symbols in atoms with a large number of electrons.


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