{{explanation}}
5 persons in square set with 5th person in center

1-8
: Corners slip-step round to the left for 4 bars, pivot turn, chase back
  to place, as 5 sets in centre
9-16
: 5 turns 1 once round RH, dance 1/2 LSh reel of 3 with 3+1
17-24
: 5 turns 4 once round LH, dance 1/2 RSh reel of 3 with 2+4, end facing
  top joining hands with 3+2
25-30
: Petronella Double Triangles (all dancing 8 bars pas de basque):

: All set, corners petronella 1 place anticlockwise **while** 5 pivots
  around to join hands with 3+4 (in 2nd & 3rd place), all set
31-32
: All continue setting as person 5 turns 4 RH into centre using pas de
  basque