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Operators in second quantization

Consider the action of aα2 on various slater determinants: aα2Φ00111=aα2|00111=0×|00111aα2Φ01011=aα2|01011=(1)×|01111aα2Φ01101=aα2|01101=0×|01101aα2Φ01110=aα2|01110=0×|01110aα2Φ10011=aα2|10011=(1)×|10111aα2Φ10101=aα2|10101=0×|10101aα2Φ10110=aα2|10110=0×|10110aα2Φ11001=aα2|11001=(+1)×|11101aα2Φ11010=aα2|11010=(+1)×|11110 What is the simplest way to obtain the phase when we act with one annihilation(creation) operator on the given Slater determinant representation?