Vocabulary consisting only from characters you are able to read
億
oku
(num) 100,000,000, hundred millionjlpt4
続々
zokuzoku
successively, one after anothermix
説く
toku
to explain, to advocate, to preach, to persuadegodan, verb
種
šu
(1)kind, variety, (2)(biological) species, (3)(abbr) (logical) species mix
関する
kansuru
to concern, to be relatedsuru
観察
kansacu
observation, surveysuru
験算
kenzan
verification of accounts, checking figures, arithmetic checksuru