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<?php for ($i = 1; $i <= 60; ++$i) { $result = []; $years = intdiv($i, 12); if ($years) { $result[] = $years . ' year' . ($years !== 1 ? 's' : ''); } $months = $i % 12; if ($months) { $result[] = $months . ' month' . ($months !== 1 ? 's' : ''); } echo implode(', ', $result) . "\n"; }

preferences:
82.11 ms | 405 KiB | 5 Q