'X = object': object
'first term of X': nothing
'second term of X': nothing
'Y = list of numbers': list of numbers
'first term of Y': number
'second term of Y': nothing
'Z = relation of texts to numbers': relation of texts to numbers
'first term of Z': text
'second term of Z': number
'W = phrase (relation of texts to numbers, text) -> truth state': phrase (relation of texts to numbers, text) -> truth state
'first term of W': relation of texts to numbers, text
'first term of first term of W': relation of texts to numbers
'first term of first term of first term of W': text
'second term of first term of first term of W': number
'second term of first term of W': text
'second term of W': truth state