// hairpin between E1 and E2
constraint I39.CB I50.CB       1 5.12 6
constraint L41.CB I48.CB       1 5.12 6

//hairpin between E2.5 and E3
constraint E85.CB K94.CB       1 5.12 6
constraint E87.CB Y92.CB       1 5.12 6


//hairpin between E4 and E5
constraint T123.CB V130.CB     1 5.12 6
constraint V121.CB V132.CB     1 5.12 6

// E3 and E4 in paralllel
constraint L91.CB V121.CB     1 5.12 6 
constraint Y92.CB Q122.CB     1 5.12 6
constraint S93.CB T123.CB     1 5.12 6
constraint K94.CB Q124.CB     1 5.12 6