six limbs —

 six ancillary subjects —

 six ancillary subjects [of vĕdham] —

 the six ancillary subjects [of vĕdhams] viś vyākaraṇam, ṣīkshā, niruktham, kalpam, chandhas, jyŏthisham —

the unique six parts of vĕdham —

 six auxiliary subjects —