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Enter a regular expression, converted to Reverse Polish style, ternary and quaternary type
Packet : 11912908java.rar filelist
JAVA\.classpath
JAVA\.project
JAVA\Four.class
JAVA\Four.java
JAVA\JMain$1.class
JAVA\JMain$2.class
JAVA\JMain$3.class
JAVA\JMain$4.class
JAVA\JMain.class
JAVA\JMain.java
JAVA\Three.class
JAVA\Three.java
JAVA\ZJMain.class
JAVA\ZJMain.java
JAVA