Select the term missing from the following series.
GPW, GPUW, GIPUW, GIPSUW, .........
Here, x+2 is done from left terms and x-2 is done from right terms where x is the alphabet from left or right side.
In GPW, W-2 = U --> GPUW
In GPUW, G+2 = I --> GIPUW
In GIPUW, U-2 = S --> GIPSUW
In GIPSUW, I+2 = K --> GIKPSUW
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