As parties adapt to these new conditions, new definitions - replete with new assumptions about their functions - are likely to shape the ongoing debate about their roles and functions in the 21st century.
conditions and definitions both end with the letter "S"
It is definitely correct to say that "conditions and definitions both end with the letter "S"" because that is the last letter for each of those two words.
( z1 end :ARG1 ( z2 and :op ( z3 condition ) :op ( z4 define ) :mod ( z5 both ) ) :ARG2 ( z6 letter :mod "S" ) )