Leibniz argument from sufficient reason

what does Leibniz distinguish between

necessary and contingent facts

Leibniz cosmological argument/ argument from sufficient reason is from what

contingency

P1 Leibniz

no fact can ever be true or existent unless there is sufficient reason why things are as they are and not otherwise

P2 Leibniz

Contingent facts exist

P3 Leibniz

Contingent facts can only be partially explained in terms of other contingent facts

C1 Leibniz

the whole series of contingent facts cannot be sufficiently explained by any contingent fact within that series

C2 Leibniz

The sufficient reason for all contingent facts and for the series of facts must lie outside of the series of contingent facts

C3

The ultimate reason for facts/things must be in a necessary substance which we call God