Eighteen Secret Liberators. As listed in Nebesky-Wojkowitz, op. cit. pp. 278-279, these comprise nine male spirits {pho dgu} namely, vajra {ging ka ra}, {rdo rje gnod sbyin}, {rdo rje srin po}, {rdo rje 'byung po}, {rdo rje spyang khyi}, {rdo rje gshin rje}, {rdo rje ro langs}, {rdo rje 'chi bdag}, and {rdo rje dus 'tshams}, and nine female spirits {mo dgu}.}, namely, {khams gsum dbugs sdud ma}, {dbang sdud lcags kyus 'dren ma}, {khams gsum rgyas 'debs ma}, {gzugs med rlung ltar 'du ma}, {gar gyi glog ltar 'du ma}, {rbod gtong lam ltar byad ma}, {rna nyan phra ma zer ma}, {khams gsum snying gsod ma}, and {tshogs kyi phyag tshangs chen mo}