With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Stanley Tucci is a film actor.
text_B: The perching ducks -LRB- `` Cairininae '' or `` Cairinini '' -RRB- were previously treated as a small group of ducks in the duck , goose and swan family Anatidae , grouped together on the basis of their readiness to perch high in trees .. duck. duck. goose. goose. swan. swan. Anatidae. Anatidae. It has been subsequently shown that the grouping is paraphyletic and their apparent similarity results from convergent evolution , with the different members more closely related to various other ducks than to each other .. paraphyletic. paraphyletic. convergent evolution. convergent evolution. The species previously included , and their current subfamilial allocation , are  :. Plectropterinae. Plectropterinae. Plectropterinae. Spur-winged goose Plectropterus gambensis. goose. goose. Spur-winged goose. Spur-winged goose. Tadorninae. Tadorninae. Tadorninae. Salvadori 's teal Salvadorina waigiuensis -LRB- initially placed in Anatinae -RRB-. Anatinae. Anatinae. Blue duck Hymenolaimus malacorhynchos. duck. duck. Blue duck. Blue duck. Torrent duck Merganetta armata. duck. duck. Torrent duck. Torrent duck. Anatinae. Anatinae. Anatinae. Brazilian teal Amazonetta brasiliensis. Brazilian teal. Brazilian teal. In addition , several species can not with certainty be allocated to a subfamily , though they do not form a distinct clade .. clade. clade. Rather , their characters are too ambiguous to allow unequivocal placement based on the available data  :. Comb duck Sarkidiornis melanotos  : Tadorninae or basal Anatinae ?. duck. duck. Tadorninae. Tadorninae. Anatinae. Anatinae. Comb duck. Comb duck. basal. Basal ( phylogenetics ). Pink-eared duck Malacorhynchus membranaceus  : Tadorninae or Oxyurinae ?. duck. duck. Tadorninae. Tadorninae. Pink-eared duck. Pink-eared duck. Oxyurinae. Oxyurinae. Hartlaub 's duck Pteronetta hartlaubi  : Anatinae or a very distinct clade ?. duck. duck. Anatinae. Anatinae. clade. clade. Green pygmy goose Nettapus pulchellus  : Anatinae or a Gondwanan clade ?. goose. goose. Anatinae. Anatinae. clade. clade. Green pygmy goose. Green pygmy goose. Cotton pygmy goose Nettapus coromandellanus  : Anatinae or a Gondwanan clade ?. goose. goose. Anatinae. Anatinae. clade. clade. Cotton pygmy goose. Cotton pygmy goose. African pygmy goose Nettapus auritus  : Anatinae or a Gondwanan clade ?. goose. goose. Anatinae. Anatinae. clade. clade. African pygmy goose. African pygmy goose. Muscovy duck Cairina moschata  : Anatinae or Tadorninae ?. duck. duck. Tadorninae. Tadorninae. Anatinae. Anatinae. Muscovy duck. Muscovy duck. White-winged duck Cairina scutulata  : Anatinae or closer to Aythyinae ?. duck. duck. Anatinae. Anatinae. White-winged duck. White-winged duck. Aythyinae. Aythyinae. Wood duck Aix sponsa  : Anatinae or Tadorninae ?. duck. duck. Tadorninae. Tadorninae. Anatinae. Anatinae. Wood duck. Wood duck. Mandarin duck Aix galericulata  : Anatinae or Tadorninae ?. duck. duck. Tadorninae. Tadorninae. Anatinae. Anatinae. Mandarin duck. Mandarin duck. Ringed teal Callonetta leucophrys  : Anatinae or Tadorninae ?. Tadorninae. Tadorninae. Anatinae. Anatinae. Ringed teal. Ringed teal. Maned duck Chenonetta jubata  : Anatinae or Tadorninae ?. duck. duck. Tadorninae. Tadorninae. Anatinae. Anatinae. Maned duck. Maned duck
not_related.