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+# week 4 deel 2
+
+## opdracht 1
+
+output:
+```bash
+$ ./main 
+tijd: 0
+        kassa 1: 
+        kassa 2: 
+        kassa 3: 
+
+tijd: 1
+        kassa 1: 
+        kassa 2: 
+        kassa 3: * * 
+
+tijd: 2
+        kassa 1: * * 
+        kassa 2: * * 
+        kassa 3: * * * * * * 
+
+tijd: 3
+        kassa 1: * * * * * * * * * * 
+        kassa 2: * 
+        kassa 3: * * * * * * * 
+
+tijd: 4
+        kassa 1: * * * * * * * * * * * * * * * 
+        kassa 2: * * 
+        kassa 3: * * * * * * * * * * * * 
+```
+etc.
+
+## opdracht 2
+
+```bash
+$ cat input.txt 
+I(){}E{}[]
+D{I(){}}W([])
+D{I(){}I(){}I(){}}W([])
+E{I(){}}W([])
+
+I{[}]
+D{}I(){}
+$ ./main < input.txt 
+line 1 is valid
+line 2 is invalid
+line 3 is invalid
+line 4 is invalid
+
+line 6 is invalid
+line 7 is invalid
+$ 
+```