Define  if  and  if , i.e.  is the one-hot encoding of the first factor and  is the one-hot encoding of the second factor.
dᵻfˈaɪn ɪf ænd ɪf , ˈaɪ.ˈiː.  ɪz ðə wˈʌnhˈɑːt ɛŋkˈoʊdɪŋ ʌvðə fˈɜːst fˈæktɚ ænd ɪz ðə wˈʌnhˈɑːt ɛŋkˈoʊdɪŋ ʌvðə sˈɛkənd fˈæktɚ.