gsang ba bsam gyis mi khyab pa'i rgyud

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 GD