审判席

• 宀(roof)RADICAL
• 申(present; explain)PHONO-SEMANTIC

Under a roof, a judge listens to testimony to render a careful verdict.

• 半(half)PHONETIC
• 刂(knife (right form))RADICAL

Using a knife to chop something in two halves is clear judgment.

• 广(roof; structure)RADICAL
• 廿(twenty; many interlaced strands)ASSOCIATIVE
• 巾(cloth; towel)ASSOCIATIVE

A mat is a woven cloth made from many fibers spread under the roof of a house to sit on.