+ foreach ($this->examples as $key => $values) {
+ if (in_array($key, ['', ' '])) {
+ unset($this->examples[$key]);
+ continue;
+ }
+ $this->examples[$key] = $this->index($values, 1);
+ if (empty($this->examples[$key]) || (count($this->examples[$key]) === 1 && $this->examples[$key][0][0] === $key)) {
+ unset($this->examples[$key]);
+ }
+ }