With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: South America's major languages are dead.
text_B: Marmara arbutiella is a moth of the Gracillariidae family .. Gracillariidae. Gracillariidae. Marmara. Marmara ( moth ). moth. moth. It is known from Canada and the United States -LRB- Oregon , Washington and California -RRB- .. Canada. Canada. United States. United States. The larvae feed on Arbutus menziesii , Arbutus unedo and Arctostaphylos species .. Arbutus menziesii. Arbutus menziesii. Arbutus unedo. Arbutus unedo. Arctostaphylos. Arctostaphylos. They mine the leaves of their host plant .. mine. leaf miner. The mine has the form of a very long , irregular , winding , serpentine mine just under the upper epidermis of the leaf .. mine. leaf miner. There are three behaviorally and morphologically distinct larval forms .. There are six to eight sap-feeding and two non-feeding , structurally differentiated instars .. The early instars are legless sap feeders .. The first of the non-feeding instars never issues from the cuticle of the previous -LRB- feeding -RRB- instar .. The second non-feeding stage is a fully legged , with rudimentary feeding structures and a functional spinneret .. Upon issuing from the mine , this instar spins a cocoon that is elaborately decorated with clusters pearly bubbles that are extruded from its anus and then individually attached to the exterior of the cocoon .. mine. leaf miner
not_related.