With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: 2007 was when Year Zero was released.
text_B: A modified version of their alpine counterparts , twin-tip skis are designed to enable a skier to take off and land backward while jumping and to ski backwards -LRB- switch -RRB- down a slope .. alpine. alpine skiing. ski. ski. skier. skiing. The name `` twin-tip '' comes from the shape of the ski .. ski. ski. While most alpine skis have a defined , curved-up front end -LRB- or `` tip '' -RRB- as well as a flat rear end -LRB- or `` tail '' -RRB- , twin-tip skis have a curved-up tip and tail .. alpine. alpine skiing. Initially designed for newschool skiing applications such as terrain parks and half-pipes , modern twin-tips have rapidly gained popularity on other parts of the mountain as well .. newschool skiing. newschool skiing. half-pipes. half-pipes. Powder skis , all-mountain skis , and even telemark skis are all available with twin tips .. telemark. telemark skiing
not_related.