‡ kotlin collections AbstractMutableCollection E MutableCollection size Int add Boolean element addAll elements Collection clear Unit contains containsAll isEmpty iterator MutableIterator remove removeAll retainAll SinceKotlin version 1.3J           ¸ "è§ *BJ2 (8H¦€J 2 (8H–€J 8H–€J2 (8H–‚J2 (8H–€J8H–€J8H¦‚J2 (8H–€J2 (8H–€J2 (8H–€RHX¦„ò, H 0 0 0 8 0 0 0²  (