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Add solution for Count Subarrays of Length Three With a Condition problem

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	`1`	`+<?php`
	`2`	`+class Solution`
	`3`	`+{`
	`4`	`+ /**`
	`5`	`+ * @param Integer[] $nums`
	`6`	`+ * @return Integer`
	`7`	`+ */`
	`8`	`+ public function countSubarrays($nums)`
	`9`	`+ {`
	`10`	`+ $count = 0;`
	`11`	`+ $n = count($nums);`
	`12`	`+ for ($i = 1; $i < $n - 1; $i++) {`
	`13`	`+ if (($nums[$i - 1] + $nums[$i + 1]) === ($nums[$i] / 2)) {`
	`14`	`+ $count++;`
	`15`	`+ }`
	`16`	`+ }`
	`17`	`+ return $count;`
	`18`	`+ }`
	`19`	`+}`
	`20`	`+`
	`21`	`+$solution = new Solution();`
	`22`	`+`
	`23`	`+$nums = [1, 2, 1, 4, 1];`
	`24`	`+`
	`25`	`+$result = $solution->countSubarrays($nums);`
	`26`	`+echo "Count of subarrays of length three with a condition: " . $result . "\n";`

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