YES

1 decompositions
 #1 -----------
   1: or(true(),true()) -> true()
   2: or(x1,x2) -> or(x2,x1)

@Development Closedness
--- R
   1: or(true(),true()) -> true()
   2: or(x1,x2) -> or(x2,x1)

--- S
   1: or(true(),true()) -> true()
   2: or(x1,x2) -> or(x2,x1)