For the integers a and b, it is stipulated that a△b=a*ba-b+1, find the value of (2△2)△2.
对于整数a，b，现规定a△b=a*b-a-b+1，求(2△2)△2的值．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 - 2 - 2</gadget>
<output>0</output>

<gadget id="calculator">0 + 1</gadget>
<output>1</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">2 - 1 - 2</gadget>
<output>-1</output>

<gadget id="calculator">(-1) + 1</gadget>
<output>0</output>

<result>0</result>