[ya] (prt) (1) such things as (non-exhaustive list related to a specific time and place); and ... and; (2) (See や否や) (after the dictionary form of a verb) the minute (that) ...; no sooner than ...; (int) (3) punctuational exclamation in haiku, renga, etc.; (aux) (4) (ksb#31
[さいご, saigo] (n, adj-no) (1) last; end; conclusion; latest; most recent; (exp) (2) (after -tara form or -ta form followed by "ga") no sooner than; right after (often having negative consequences); (3) (arch) (See 最期) one's final moments; (P)#683
[いっそう, issou] (adv, adj-no) (1) (uk) much more; still more; all the more; more than ever; (n, adj-no) (2) single layer (or storey, etc.); (adv) (3) (arch) (See いっそ) rather; sooner; preferably; (P)#14746