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class LinearCombinationOfGates: Represents linear operator defined by a linear combination of gates.
class LinearCombinationOfOperations: Represents operator defined by linear combination of gate operations.
class PauliSum: Represents operator defined by linear combination of PauliStrings.
PauliSumLike: Any value that can be easily translated into a sum of Pauli products.
UnitPauliStringT: The central part of internal API.