National - center-right or conservative
ACT - market liberal or libertarian
these two parties are joined at the hip
NZ First - centrist / populist
this part has swung both ways and is inclined, this time around, to join with National
it looks 50-50 that National + ACT will finish with a majority of the seats
if not, National + ACT + NZ First
It looks like they have to do all three right leaning parties in order to form government. Although, if things hold, the National Party could do it with ACT and squeak by.