Statements: I. Some keys are locks, some locks are numbers. II. All numbers are letters, all letters are words. Conclusions: I. Some words are numbers. II. Some locks are letters.

Statement I consists of two Particular Affirmative (I-type) Premises.
Statement II consists of two Universal Affirmative (A-type) Premises.
Some locks are numbers. ↔ All numbers are letters.
I + A ⇒ I-type of Conclusion "Some locks are letters".
This is Conclusion II.
All numbers are letters. ↔ All letters are words.
A + A ⇒ A-type of Conclusion "All numbers are words".
Conclusion I is Converse of it.