You exhaust yourself, and just as you're about to give up, you realize there's a special, unique word in one of the earliest messages in the conversation.
In an earlier message the prime minister said she was confident of continued cooperation with the US with Trump in the White House.
In an earlier message posted on the Twitter UK blog, the company's senior director for trust and safety, Del Harvey, and Mr Wang, said the company had clarified its anti-harassment policy in light of feedback from customers.
With origins in the earliest internet message boards, it plays off of both meanings of a pair of homonyms: the verb "to troll", a method of fishing; and the noun, the monster from Scandinavian folklore.
In an earlier message he had said, "CNN and AP bias to point of embarrassment".
It withdrew a demand for $200 million £132mm) in ransom for Mr Goto and Mr Yukawa, made in an earlier message.
In an earlier message to colleagues and traders at other banks, including Deutsche Bank, Tan writes: "It's just amazing how Libor fixing can make you that much money or lose if opposite... It's a cartel now in London".
The voice sounds identical to the one used in earlier messages released by the militant group.
The 30-second clip does not include video footage of Goto, but features audio that is purportedly a recording of his voice, which sounds identical to the voice featured in earlier messages released by the group.
At the time, however, that earlier message remained locked in the state department's archives, unknown to a wider world.
In place of an earlier message of coexistence with Palestinians, albeit under Israeli sovereignty, he waves his fist in the air and calls on Zionists to keep fighting.
