You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who organized known elements by placing them into groups of three called triads?" whose answer is Johann Wolfgang Dobereiner.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who organized known elements by placing them into groups of three called triads
Useful Output:

Doc 1: As Jensen reminds readers in his paper, triads of elements were first discussed by the German chemist Wolfgang Döbereiner in the early 1800s (
Doc 2: He arranged the elements into groups containing three elements each. He called these groups as 'triads' (tri – three). Dobereiner showed
Doc 3: Dobereiner proposed that all elements could be grouped in such triads, but subsequent attempts to expand his concept were unsuccessful. We now
Doc 4: He classified some elements into groups of three, which he called triads.2. It was proposed by John Newlands which was based on the fact
Doc 5: Johann Dobereiner organized known elements into triads, groups of three that showed similar properties. This classification effort took place in