#NEWLINE# def __init__( self , fields ) : #NEWLINE# #INDENT# ( primary_fields , variables ) = typifyFields ( fields ) #NEWLINE# self . primary_fields = primary_fields #NEWLINE# self . _derived_start = len ( variables ) #NEWLINE# variables += interactions ( fields , primary_fields ) #NEWLINE# variables += missing ( variables ) #NEWLINE# self . _missing_field_indices = missing_field_indices ( variables ) #NEWLINE# self . _interaction_indices = interaction_indices ( variables ) #NEWLINE# self . _variables = variables