def constraint2(x): # impose exactly
return impose_sum(7.5*len(x), x)
def constraint2(x): # impose exactly
return impose_sum(7.5*len(x), x)
def constraint2(x): # impose exactly
return impose_sum(7.5*len(x), x)
def constraint2(x): # impose exactly
return impose_sum(7.5*len(x), x)