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## tax_validation.php
<?php

/**
 * This method logically validates Turkish VAT number
 *
 * @param string $taxNumber
 * @return bool
 */
public function validateTaxNumber(string $taxNumber): bool
{
	<?php

	/**
	* This method logically validates Turkish VAT number
	*
	* @param string $taxNumber
	* @return bool
	*/
	public function validateTaxNumber(string $taxNumber): bool
	{