With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Jon Pertwee was in a series based on books by an English author.
text_B: Structural elements are used in structural analysis to split a complex structure into simple elements .. structural analysis. structural analysis. elements. Wiktionary :element. Within a structure , an element can not be broken down -LRB- decomposed -RRB- into parts of different kinds -LRB- e.g. , beam or column -RRB- .. Structural elements can be linear , surfaces or volumes .. elements. Wiktionary :element. Linear elements  :. elements. Wiktionary :element. Rod - axial loads. Rod. Rod ( geometry ). Beam - axial and bending loads. Beam. Beam ( structure ). bending. bending. Struts or Compression members - compressive loads. compressive loads. compressive stress. Ties , Tie rods , eyebars , guy-wires , suspension cables , or wire ropes - tension loads. Tie. Tie ( engineering ). tension. Tension ( physics ). Surface elements  :. elements. Wiktionary :element. membrane - in-plane loads only. shell - in plane and bending moments. bending. bending. shell. thin-shell structure. Concrete slab. Concrete slab. Concrete slab. deck. deck. Deck ( bridge ). shear panel - shear loads only. shear panel. shear wall. Volumes  :. Axial , shear and bending loads for all three dimensions. bending. bending
not_related.