{
    alpha1   [
        [0] {
            beta   {
                delta   "lambda",
                gamma   "theta"
            }
        },
        [1] {
            beta   {
                gamma   "zeta"
            }
        }
    ],
    alpha2   [
        [0] {
            beta   {
                delta   "lambda",
                gamma   "theta"
            }
        },
        [1] {
            beta   {
                gamma   "theta"
            }
        }
    ]
}
## Original state:
alpha2 is unique.
alpha1 has a duplicate.
## After pushing another element onto 'alpha2':
alpha2 has a duplicate.
alpha1 has a duplicate.