读
JLPT HSK 1

dòu, dú
Left: word 讠/言 (sound waves out of a mouth 口), right: to sell 卖 (For ten 十 [coins] the hat 乛 of the leader 头 is sold.) [leader 头 = The big 大 one with protruding eyes 丶]
Words which were sold, can be read.

	买
JLPT HSK 1

mǎi
Top: a stroke 乛 (here: a cap), below: head/leader 头 [= the big 大 with protruding eyes 丶]
(together with: to sell 卖) This hat 乛 is what the leader 头 has bought 买. (... but for 10 十 [coins] he wants to sell 卖 it.)

	卖
JLPT HSK 2

mài
From top: ten 十, a cap 乛, leader/head 头 (= the big 大 one with protruding eyes 丶)
(together with: to buy 买, which shows that leader 头 with the cap 乛) This cap 乛 is what the leader 头 has bought 买, but for 10 十 (coins) he wants to sell 卖 it.

	实
JLPT HSK 3

shí
Top: roof 宀, below: leader 头 (= The big 大 one with protruding eyes 丶)
(Only one master can rule the household) Under a roof is (just) one leader. This is a real fact!

	头
JLPT HSK 3

tóu, tou
Big 大 with two protruding eyes 丶
The big one with the protuding eyes is our leader and chief.

	续
JLPT HSK 4

xù
Left: thread 纟/糸, right: sell 卖 (For ten 十 [coins] the hat 乛 of the leader 头 is sold) [leader 头 = The big 大 one with protruding eyes 丶]
Threads are endless, such that the sale proceeds continously.

	赎
JLPT no HSK

shú
Left: money 贝, right: to sell 卖 (For ten 十 [coins] the hat 乛 of the leader 头 is sold) - [leader 头 = The big 大 one with protruding eyes 丶]
To use money for 'selling' means to redeem.

	窦
JLPT no HSK

dòu
Top: hole, cavity 穴 (It is covered 宀 and a narrowing path 八 leads into the cave), below: to sell 卖 (For ten 十 [coins] the hat 乛 of the leader 头 is sold)
(On the sales shelf) The hole is where something was sold: As a hole or void, where sth. is missing.