`aa_allow: /* innermost frame allows a */`
`aa_block: /* innermost frame denies a */`
`aa2_block: /* innermost frame (view-source: URL) denies a */`
`ab_allow: /* innermost frame allows a */`
`ab_block: /* innermost frame denies a */`
`aba_allow: /* innermost frame allows b,a */`
`aba_block: /* innermost frame denies b */`
`aba2_block: /* innermost frame denies a */`
`abb_allow: /* innermost frame allows b,a */`
`abb_block: /* innermost frame denies b */`
`abb2_block: /* innermost frame denies a */`