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up/down counter with down flip-flops

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flake

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Consider a 1-bit slice (module) for an n-bit up/down counter There are two control inputs: cnt_en, and up/ down , controlling counting and direction respectively.
How can I make a design for this module?
I need to using D-Flip-Flops, and a minimum amount of NANDs and NORs gates as needed.
 

Since it seems a homework, will give you only a hint.

One bit slice block with a full adder followed by a flop. Connect them in a ripple carry fashion.
For n bit, you need only n full adders and n flops if you cleverly use cnt_en and up/down signals.
 
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what exactly does it mean by 'slice'?
 

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