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kumar 420kumar 420 

update Sequnce number fields of contact object using by before update trigger

so give me answer that work on update .  if i update one Sequnce number than only chage two values that mean 
i have sequnce number 1  2   3  4   5    and i will update the 3 hence 5   than   the sequnce is   1   2   5   3  4 only chage that 3  and 5 and not chage another sequnce number
please give me answer
thanks