var i[2] = [0,1]
var j[2] = [10,20]
var k[2] = [25,30]
var l[2] = [3,4]

i += [2,3]		# [2,4]
i -= [1,4]		# [1,0]

j *= [2,3]		# [20,60]
j /= [4,4]		# [5,15]

k %= [10,11]		# [5,8]

l++			# [4,5]
l++			# [5,6]
l--			# [4,5]
