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We show there are at least 28 distinct true SLOCC entanglement classes forfour-qubits by means of SLOCC invariant and semi-invariants and derive thenumber of the degenerated SLOCC classes for n-qubits.Comment: 22 pages, no figures, 9 tables, submit the paper to a journa

Classification of four-qubit states by means of a stochastic local operation and the classical communication invariant and semi-invariants