add old files requirements.txt

data/word_sets/birds.txt

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+Sparrow
+Robin
+Blue Jay
+Cardinal
+Crow
+Raven
+Pigeon
+Dove
+Seagull
+Eagle
+Hawk
+Falcon
+Owl
+Vulture
+Parrot
+Cockatoo
+Macaw
+Toucan
+Penguin
+Flamingo
+Peacock
+Swan
+Duck
+Goose
+Pelican
+Heron
+Crane
+Egret
+Kingfisher
+Woodpecker
+Hummingbird
+Swallow
+Lark
+Canary
+Finch
+Wren
+Starling
+Nightingale
+Cuckoo
+Magpie
+Jay
+Kite
+Condor
+Buzzard
+Stork
+Cormorant
+Albatross
+Puffin
+Tern
+Sandpiper
+Plover
+Kiwi
+Emu
+Ostrich
+Turkey
+Chicken
+Rooster
+Quail
+Partridge
+Pheasant
+Grouse
+Cockatiel
+Budgerigar (Budgie)
+Lovebird
+Lyrebird
+Hoopoe
+Hornbill
+Drongo
+Bowerbird
+Bee-eater
+Sunbird
+Weaver
+Mockingbird
+Thrush
+Blackbird
+Goldfinch
+Warbler
+Titmouse
+Chickadee
+Tanager
+Shrike
+Skylark
+Rook
+Lapwing
+Avocet
+Ibis
+Spoonbill
+Jacana
+Rails
+Grebe
+Loons
+Petrels
+Shearwater
+Bittern