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API References
qiskit.aqua
qiskit.chemistry
qiskit.chemistry.algorithms
qiskit.chemistry.components
qiskit.chemistry.core
qiskit.finance
qiskit.ml
qiskit.optimization
Troubleshooting
qiskit.chemistry.components.variational_forms
Getter of double excitation list :returns: double excitation list :rtype: list[list[int]]