Wash. Rev. Code § 11.104B.170
(1) A unitrust policy must provide the period used under RCW 11.104B.150 and 11.104B.160. Except as otherwise provided in RCW 11.104B.180(2)(c), the period may be:
(2) Except as otherwise provided in RCW 11.104B.180(2), a unitrust policy may provide standards for:
(a) Using fewer preceding periods under RCW 11.104B.150 (1)(b)(ii) or (2)(c) or (d) if:
(b) Using fewer preceding periods under RCW 11.104B.160(2) (e)(i) or (ii), (f)(ii), or (g)(ii) if:
[ 2021 c 140 s 2308.]