#15.3_primary_frame_of_project
'''three important qustions
1.hpw to decide helix
2.the N-seq, what?
3.how to get the position and seq 
def read_seq(filename):
	'''read sequences from file'''
	pass


def sum_of_N_seq(sequences):
	'''sum for each frequency of N-seq '''
	pass


def print_predicted_helix():
	'''print the seq and position of predicted helix'''
	pass

