With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Richard III of England was a king in the 15th century.
text_B: The Paleozoic -LRB- or Palaeozoic -RRB- Era -LRB- -LSB- pronˌpeɪliəˈzoʊɪk ,   ˌpæ - -RSB- from the Greek palaios , `` old '' and zoe , `` life '' , meaning `` ancient life '' -RRB- is the earliest of three geologic eras of the Phanerozoic Eon , from .. geologic eras. era ( geology ). Phanerozoic. Phanerozoic. It is the longest of the Phanerozoic eras , and is subdivided into six geologic periods -LRB- from oldest to youngest -RRB-  : the Cambrian , Ordovician , Silurian , Devonian , Carboniferous , and Permian .. Phanerozoic. Phanerozoic. geologic periods. period ( geology ). Cambrian. Cambrian. Ordovician. Ordovician. Silurian. Silurian. Devonian. Devonian. Carboniferous. Carboniferous. Permian. Permian. The Paleozoic comes after the Neoproterozoic era of the Proterozoic and is followed by the Mesozoic .. Neoproterozoic. Neoproterozoic. Proterozoic. Proterozoic. Mesozoic. Mesozoic. The Paleozoic was a time of dramatic geological , climatic , and evolutionary change .. The Cambrian witnessed the most rapid and widespread diversification of life in Earth 's history , known as the Cambrian explosion , in which most modern phyla first appeared .. Cambrian. Cambrian. Cambrian explosion. Cambrian explosion. phyla. phylum. Fish , arthropods , amphibians , anapsids , synapsids , euryapsids and diapsids all evolved during the Paleozoic .. Fish. Fish. euryapsids. euryapsida. Life began in the ocean but eventually transitioned onto land , and by the late Paleozoic , it was dominated by various forms of organisms .. Great forests of primitive plants covered the continents , many of which formed the coal beds of Europe and eastern North America .. coal. coal. Europe. Europe. North America. North America. Towards the end of the era , large , sophisticated diapsids and synapsids were dominant and the first modern plants -LRB- conifers -RRB- appeared .. conifers. Pinophyta. The Paleozoic Era ended with the largest extinction event in the history of Earth , the Permian -- Triassic extinction event .. Permian. Permian. extinction event. extinction event. history of Earth. history of Earth. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic Era to recover .. Mesozoic. Mesozoic. Recovery of life in the sea may have been much faster .
not_related.