model - 1                       model - 2                       model - 3                       model - 4                       model - 5                       model - 6
model - 7                       model - 8                       model - 9                      model - 10                      model - 11                     model - 12
model - 13                     model - 14                     model - 27                     model - 31                     model - 32                     model - 33
model - 34