types of tone units

1: proclictics + nuclear + enclictics ( ... --- ... )
2: procilctics + nuclear ( ... --- )
3: nuclear + enclictics ( --- ... )
4. nuclear ( --- )

Type 2 > type 1 > type 4 > type 3
Type 2 > type 4 > type 1 > type 3

Type 2: 50 to 60 pc
type 1 and 4: 35 to 40 pc