[
    Expression {
        expr: LogicalOperation(
            Not {
                span: (
                    3,
                    1,
                ),
                right: Variable(
                    SimpleVariable(
                        SimpleVariable {
                            span: (
                                3,
                                2,
                            ),
                            name: "a",
                        },
                    ),
                ),
            },
        ),
    },
    Expression {
        expr: LogicalOperation(
            Not {
                span: (
                    4,
                    1,
                ),
                right: LogicalOperation(
                    Not {
                        span: (
                            4,
                            2,
                        ),
                        right: Variable(
                            SimpleVariable(
                                SimpleVariable {
                                    span: (
                                        4,
                                        3,
                                    ),
                                    name: "b",
                                },
                            ),
                        ),
                    },
                ),
            },
        ),
    },
    Expression {
        expr: LogicalOperation(
            Not {
                span: (
                    5,
                    1,
                ),
                right: Variable(
                    SimpleVariable(
                        SimpleVariable {
                            span: (
                                5,
                                3,
                            ),
                            name: "a",
                        },
                    ),
                ),
            },
        ),
    },
    Expression {
        expr: LogicalOperation(
            Not {
                span: (
                    6,
                    1,
                ),
                right: LogicalOperation(
                    Not {
                        span: (
                            6,
                            3,
                        ),
                        right: Variable(
                            SimpleVariable(
                                SimpleVariable {
                                    span: (
                                        6,
                                        5,
                                    ),
                                    name: "a",
                                },
                            ),
                        ),
                    },
                ),
            },
        ),
    },
]