local root = {
    {
        action = '=',
        fun = 'equal'
    },
    {
        action = '+',
        fun = 'add'
    },
    {
        action = '-',
        fun = 'subtract'
    },
    {
        action = 'max',
        fun = 'max'
    },
    {
        action = 'min',
        fun = 'min'
    },
    {
        action = 'weightNum',
        fun = 'weightNum'
    },
    {
        action = 'weight',
        fun = 'weight'
    }
}
return root