Mastering Japanese, 10 Compact Disks and fast-paced Textbook. Based on Eleanor Jordan's Yale University curriculum, this program does not lend itself to laziness, but is for those interested in well designed, but tough audio drills.
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The same publication included a political article on an American presidential visit. Within that article the following loanwords (excluding contemporary personal names) occurred.
アジア
タイ
バンコク
ベトナム
サイゴン
マニラ
グアム
インド
ニューデリー
ルーマニア
ブカレスト
チェコスロバキア
プラハ
ポーランド
アメリカ
azia 'Asia'
tai 'Thai[land]'
bankoku 'Bangkok'
betonamu 'Vietnam'
saigon 'Saigon'
manira 'Manila'
guamu 'Guam'
indo 'India'
nyuuderii 'New Delhi'
ruumania 'Rumania'
bukaresuto 'Bucharest'
t(i)ekosurobakia 'Czechoslovakia'
puraha 'Prague'
poorando 'Poland'
amerika 'America'
(Note that the borrowing for 'Prague' is based on the native pronunciation.)
"...one-fourth of all the characters used in modern Japanese occur in three-fourths of all the most frequently occurring words. This means that by concentrating on learning approximately 500 select characters, the student is assured of being able to read 75% of all the high-frequency words he will encounter in modern literature." - The Kanji Way to Japanese Language Power.