Quite a number of the Chinese radicals have more than 1 option of their writing.

Thus,

Radical No.  2 亅  jué  ’hook’  has another option of writing:  了,

Radical No.  5  乙 yǐ  ‘second’  has the options of writing:  乚⺄㇆乛,

Radical No.  8  八  bā  ’eight’  has the option of inverted writing:  丷,

Radical No.  12  刀  dāo  ’knife’  has the following options of writing:  ⺈クリ刂 etc.

 

For more detais on that please check: “Table of the Chinese Radicals” by Polina Shinkina

http://www.lulu.com/content/e-book/table-of-the-chinese-radicals/18919021

http://www.lulu.com/spotlight/polina985

Cover-Table-of-the-Chinese-Radicals

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