写
JLPT HSK 1

xiě
Top: a cover 冖 (here: variation of table 几), below: and, with 与 (= The number 5 and one 一 is an "and"-connection. - But here as its sum of: six)
You need a table and six (papers) for: writing.

	与
JLPT HSK 4

yú, yǔ, yù
An arabic five 5 and the Chinese one 一
'Five' and 'one' is an "and"-connection.

	屿
JLPT HSK 5

yǔ
Left: mountain 山, right: and/together 与 (arabic five 5 and one 一 is "and"-connection), here: Variation of island 岛 (= mountain 山, which only a bird 鸟/鳥 can reach)
The mountain which only a simplified bird can reach, get is an islet. (In comparison to island 岛, the bird has only space at the side of the mountain.)

	欤
JLPT no HSK

yú
Left: and/with 与 (the number 5 and one 一 is an "and"-connection), right: lack 欠 (A yawning person 人 is lacking sth.)
And when having a lack? - Then I ask!