We chatted with one my friend, and I occasionally said that I am learning Japanese. She wants to learn Japanese for years, so she registered at LingQ and asked me what to do. As usual I advised her to learn hiragana first. So, I opened Library and searched for Emma’s “Hiragana drill” collection. When I opened it I saw
あいうえお・かきくけこ 0:44 Advanced 2 5 (19%)
さしすせそ・たちつてと 1:00 Advanced 2 3 (9%)
なにぬねの・はひふへほ 1:09 Advanced 2 -1 (-3%)
まみむめも・やゆよ 0:46 Advanced 2 4 (12%)
らりるれろ・わをん 0:49 Advanced 2 -5 (-16%)
がぎぐげご・ざじずぜぞ 0:54 Advanced 2 -3 (-8%)
だぢづでど・ばびぶべぼ 1:00 Advanced 2 -5 (-13%)
ぱぴぷぺぽ・きゃきゅきょ・ぎゃぎゅぎょ 1:12 Advanced 2 -1 (-2%)
しゃしゅしょ・じゃじゅじょ・ちゃちゅちょ 1:04 Advanced 2 -3 (-7%)
にゃにゅにょ・ひゃひゅひょ・びゃびゅびょ・ぴゃぴゅぴょ 1:14 Advanced 2 8 (19%)
As you see some lessons have negative number of Unknown words :)) I suppose it because I have learnt not only words from this lesson, but phrases too.