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diff --git a/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Xlfn.php b/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Xlfn.php
new file mode 100644
index 0000000..9c56ff4
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+++ b/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Xlfn.php
@@ -0,0 +1,159 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;
+
+class Xlfn
+{
+    const XLFNREGEXP = '/(?<!_xlfn[.])\\b('
+            // functions added with Excel 2010
+        . 'beta[.]dist'
+        . '|beta[.]inv'
+        . '|binom[.]dist'
+        . '|binom[.]inv'
+        . '|chisq[.]dist'
+        . '|chisq[.]dist[.]rt'
+        . '|chisq[.]inv'
+        . '|chisq[.]inv[.]rt'
+        . '|chisq[.]test'
+        . '|confidence[.]norm'
+        . '|confidence[.]t'
+        . '|covariance[.]p'
+        . '|covariance[.]s'
+        . '|erf[.]precise'
+        . '|erfc[.]precise'
+        . '|expon[.]dist'
+        . '|f[.]dist'
+        . '|f[.]dist[.]rt'
+        . '|f[.]inv'
+        . '|f[.]inv[.]rt'
+        . '|f[.]test'
+        . '|gamma[.]dist'
+        . '|gamma[.]inv'
+        . '|gammaln[.]precise'
+        . '|lognorm[.]dist'
+        . '|lognorm[.]inv'
+        . '|mode[.]mult'
+        . '|mode[.]sngl'
+        . '|negbinom[.]dist'
+        . '|networkdays[.]intl'
+        . '|norm[.]dist'
+        . '|norm[.]inv'
+        . '|norm[.]s[.]dist'
+        . '|norm[.]s[.]inv'
+        . '|percentile[.]exc'
+        . '|percentile[.]inc'
+        . '|percentrank[.]exc'
+        . '|percentrank[.]inc'
+        . '|poisson[.]dist'
+        . '|quartile[.]exc'
+        . '|quartile[.]inc'
+        . '|rank[.]avg'
+        . '|rank[.]eq'
+        . '|stdev[.]p'
+        . '|stdev[.]s'
+        . '|t[.]dist'
+        . '|t[.]dist[.]2t'
+        . '|t[.]dist[.]rt'
+        . '|t[.]inv'
+        . '|t[.]inv[.]2t'
+        . '|t[.]test'
+        . '|var[.]p'
+        . '|var[.]s'
+        . '|weibull[.]dist'
+        . '|z[.]test'
+        // functions added with Excel 2013
+        . '|acot'
+        . '|acoth'
+        . '|arabic'
+        . '|averageifs'
+        . '|binom[.]dist[.]range'
+        . '|bitand'
+        . '|bitlshift'
+        . '|bitor'
+        . '|bitrshift'
+        . '|bitxor'
+        . '|ceiling[.]math'
+        . '|combina'
+        . '|cot'
+        . '|coth'
+        . '|csc'
+        . '|csch'
+        . '|days'
+        . '|dbcs'
+        . '|decimal'
+        . '|encodeurl'
+        . '|filterxml'
+        . '|floor[.]math'
+        . '|formulatext'
+        . '|gamma'
+        . '|gauss'
+        . '|ifna'
+        . '|imcosh'
+        . '|imcot'
+        . '|imcsc'
+        . '|imcsch'
+        . '|imsec'
+        . '|imsech'
+        . '|imsinh'
+        . '|imtan'
+        . '|isformula'
+        . '|iso[.]ceiling'
+        . '|isoweeknum'
+        . '|munit'
+        . '|numbervalue'
+        . '|pduration'
+        . '|permutationa'
+        . '|phi'
+        . '|rri'
+        . '|sec'
+        . '|sech'
+        . '|sheet'
+        . '|sheets'
+        . '|skew[.]p'
+        . '|unichar'
+        . '|unicode'
+        . '|webservice'
+        . '|xor'
+        // functions added with Excel 2016
+        . '|forecast[.]et2'
+        . '|forecast[.]ets[.]confint'
+        . '|forecast[.]ets[.]seasonality'
+        . '|forecast[.]ets[.]stat'
+        . '|forecast[.]linear'
+        . '|switch'
+        // functions added with Excel 2019
+        . '|concat'
+        . '|countifs'
+        . '|ifs'
+        . '|maxifs'
+        . '|minifs'
+        . '|sumifs'
+        . '|textjoin'
+        // functions added with Excel 365
+        . '|filter'
+        . '|randarray'
+        . '|sequence'
+        . '|sort'
+        . '|sortby'
+        . '|unique'
+        . '|xlookup'
+        . '|xmatch'
+        . ')(?=\\s*[(])/i';
+
+    /**
+     * Prefix function name in string with _xlfn. where required.
+     */
+    public static function addXlfn(string $funcstring): string
+    {
+        return preg_replace(self::XLFNREGEXP, '_xlfn.$1', $funcstring);
+    }
+
+    /**
+     * Prefix function name in string with _xlfn. where required.
+     * Leading character, expected to be equals sign, is stripped.
+     */
+    public static function addXlfnStripEquals(string $funcstring): string
+    {
+        return self::addXlfn(substr($funcstring, 1));
+    }
+}