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**Boolean algebra problem!!**

Hello everyone 'im designing a IC that will tell output a 1 if the number is > 9. so I wrote this boolean expression but i'm stuck on reducing it.

B' = B compelemnted

AB'CD' + AB'CD + ABC'D' + ABC'D + ABCD' + ABCD

AB'(CD' + CD) + AB(C'D' + C'D + CD' + CD)

any hints? thanks!