c1 = container(1, 2, 3)
c2 = container(1, 3, 2)
c1 == c1            # TRUE
c1 != c2            # TRUE
c1 <= c1            # TRUE
c1 == c2            # FALSE
c1 < c2             # TRUE
c1 < container(2)   # TRUE
c1 < container()    # FALSE
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