Find the value of $a^{2}+b^{2}+c^{2}-2ab+2ac-2bc$,if $a=x+y$,$b=x-y$,and $c=2x-1$.
- A$(2x+2y+1)^{2}$
- B$(2x-2y+1)^{2}$
- C$(2x-2y-1)^{2}$
- D$(1-2x-2y)^{2}$
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