ⵉⵜⵜⵓⵙⵓⵍⵖ ⵡⴰⴽⴰⵍ ⵙ ⵜⵎⴰⵎⴽⵜ ⴰⴷ ⵙⴳ ⵡⴰⵜⵜⴰⵢⵏ ⵏ 4.54 ⵎⵍⵢⴰⵕ ⵏ ⵉⵙⴳⴳⵯⴰⵙⵏ (ⴳ ⵉⵍⵍⴰ ⵛⵛⴽ 1%) ⴷ ⵜⵜⵓⵙⵎⴰⴷ ⴳ ⵜⵉⵣⵉ ⵏ 10–20 ⵏ ⵉⴷ ⵎⵍⵢⵓⵏ ⵏ ⵓⵙⴳⴳⴰⵙ.