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plt-scheme  4.2.1
CommandSequence.java
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00001 package graphics;
00002 
00003 public abstract class CommandSequence {
00004   abstract void drawAll(View v);
00005   public CommandSequence reverse() {
00006     return this.rev(new EmptySeq());
00007   }
00008   abstract CommandSequence rev(CommandSequence acc);
00009 }