"That's not right!" Fang Keyu said again. "According to your reasoning, the murderer isn't Jiao Tengyi. But the death message left by the victim clearly points to him as the killer. Are you suggesting that this death message was forged by the murderer?"
Xiao Wentai smiled and replied, "This death message actually indicates even more strongly that Jiao Tengyi is not the murderer! As I mentioned earlier, the killer could have easily seen this death message while committing the crime and had ample time to destroy it. If Jiao Tengyi were truly the murderer, why wouldn't he destroy this piece of evidence that is so detrimental to him when he saw such a clear indication pointing to him?
The only logical answer is that the murderer attacked the victim from behind that night. The killer assumed that in the chaos of struggling, the victim mistook his face for Jiao Tengyi's, which is why he left behind the letters 'jti'.
The murderer must have been delighted, as he intended to frame Jiao Tengyi, and now he had an additional piece of evidence.
However, unfortunately, the death message left by the victim does not refer to 'Jiao Tengyi'..."
"How is that possible?" Fang Kehui exclaimed, his eyes wide.
"The reason we conclude that these three letters refer to 'Jiao Tengyi' is simply based on its Hanyu Pinyin. Think about it: how is 'Jiao Tengyi' written in Hanyu Pinyin?"
"It's jiāo téng yī!" Fang Keyu finally had a moment of clarity.
"Exactly! Notice that for the first two characters 'Jiao' and 'Teng', we take their initials, which are 'j' and 't'. However, for the third character '一', we take the second letter of its pinyin 'i'. Logically speaking, the letters should all follow the same rule, so it should have been 'jty' instead! But that's not the case here. The only reasonable explanation for this discrepancy is that these three letters do not point to Jiao Tengyi; the real murderer must be someone else! The answer lies in Sun Lang's Password Diary and this Alphabet! Now, has anyone noticed these circled letters?"
Fang Keyu scratched his head again and said, "There are 'a', 'i', 'u', 'e', and 'o'. Could this be romaji in Japanese, referring to the hiragana あ, い, う, え, お?"
Xiao Wentai banged his head against the wall and exclaimed, "Come on! Please use your brain! There's also a 'v' here!"
Fang Kehui suddenly spoke up, "I get it now. When we type on a computer using Pinyin input method, doesn't this 'v' represent a single vowel sound in Pinyin—specifically 'ü'? So these six letters are actually the six basic single vowel sounds in Hanyu Pinyin!"
“Not bad! Smart! Much better than your brother!” Xiao Wentai gave a thumbs up.
Hearing such praise, Fang Kehui felt a bit flushed and suddenly became somewhat embarrassed.
Xiao Wentai continued, “I casually picked two entries from the Password Diary and noticed a commonality: the first letter of each word is basically one of these six basic vowels. This led me to think that this so-called Password Diary must be derived from Hanyu Pinyin.
I tried swapping the first two letters of each word and then the third and fourth letters. However, this still yielded no results.
Next, I noticed that the only non-vowel letter in the original text was ‘j’. This immediately made me think of the retroflex sounds ‘ch’, ‘sh’, and ‘zh’ in Hanyu Pinyin. It’s very likely that this ‘j’ is related to ‘h’!
Then I recalled that Sun Lang attached the Alphabet to make it clear to understand the order of the letters. Therefore, this password is closely related to the order of the Alphabet.
So, I grouped the letters within the six circles together and grouped the remaining letters separately. I replaced each letter in the rearranged password according to their respective groups' Alphabet order with the letter that comes before it, and that’s how the answer appeared.”
Xiao Wentai transformed these two entries from the Password Diary into the following:
Year Month Day
Wednesday Sunny
Today my mood is pretty good. Fang Zhongyu has become my girlfriend. I feel that today is the happiest day of my life!
Year Month Day
Thursday Overcast
I discovered that I am living with Fang. She is very angry and told me that one day I will have to pay for this. But I’m not afraid!
Date:
Wednesday
Sunny
Today I am in a good mood. Fang finally agreed to be my girlfriend. I feel like today is the happiest day of my life!
Date:
Thursday
Overcast
Yu discovered that Fang and I are together. He was very angry and told me that one day I would pay for this.
But unfortunately, I'm not afraid!
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