# DNA Pairing *isssue*

DNA Pairing *isssue*
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#1

So i understood the basic idea of `DNA` sequence .its the process of working out the order of the four bases `A,C,G,T` in a strand .And the given examples on the challenge also makes sense except the second one.

I dont understand , i mean can we put base from the four DNA bases even tho the base is not present in the sequence. Clearly `TTGAG` dont have `C` in it but still it prints `["G","C"]` . HOW ?? some explanation would be great.
[I have not started coding for the algo yet tho , im just trying to understand the problem first, so didn’t provide any link]
@randelldawson wanna take a look mate !

#2

Hi,
Your code needs to contain some sort of lookup scheme. For example, if you look up A your lookup will reply T. Then you put that in arrays as required by the challenge.

`TTGAG --> [["T", _], ["T", _], [ "G", _ ], ["A", _ ], ["G",_ ]]`
You fill in the blanks.
`[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]`