Iam trying to carry out a laboratory experiment in which I have to draw a logic symbol diagram of a 4-input OR gate using two 2-input Or gates. Iam only managing to use a minimum of 3 Or gates how can i simplify this to 2 gates?

Together with this I have to produce a 7input Nand function using a 4 input Nand gate and an OR gate how would this be possible? Would I need to produce the 7 input truth table ?

Thanks