How many different methods are there to take three numbers from 1-100 in natural numbers, so that there are two numbers and only two numbers are adjacent to each other?
从自然数中1-100中取出三个数，使得其中有两个数而且仅有两个数相邻，不同取法一共有多少种？
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">99 - 2</gadget>
<output>97</output>

<gadget id="calculator">97 * 2</gadget>
<output>194</output>

<gadget id="calculator">100 - 4</gadget>
<output>96</output>

<gadget id="calculator">97 * 96</gadget>
<output>9_312</output>

<gadget id="calculator">194 + 9_312</gadget>
<output>9_506</output>

<result>9_506</result>