Bill Kelly wrote:
> Nanyang Zhan wrote:
>> Given any four letter word, for example: "card"
>> Replace one to three letters with "~",
>> How can I get the result collection ( ["~ard", "c~rd", ..., "~~r~",
>> "~~~d"])?
> 
> One idea:
> 
> irb> 1.upto(14) {|i| printf("%04b\n", i)}
> 0001
> 0010
> 0011
> 0100
> 0101
> 0110
> 0111
> 1000
> 1001
> 1010
> 1011
> 1100
> 1101
> 1110
> 
> 
> Regards,
> 
> Bill

Thanks.
Given I have the 0 and 1 array,
Replacing all the 0s with "~", and replacing all the 1s with the right 
letters, I think it should work.

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