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import java.util.ArrayList as ArrayList
arr = ArrayList()
arr.add(10)
arr.add(20)
print "ArrayList:",arr
arr.remove(10) #remove 10 from arraylist
arr.add(0,5) #add 5 at 0th index
print "ArrayList:",arr
print "element at index 1:",arr.get(1) #retrieve item at index 1
arr.set(0,100) #set item at 0th index to 100
print "ArrayList:",arr
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