Partial Dynamical Symmetries in the g9/2 Shell-Progress and Puzzles
  We present analytic proofs of the properties of four particle states in the g9/2 shell which have seniority v=4 and angular momentum I=4 or 6.We show in particular that the number of pairs with angular momentum I is equal to one for these states. 
Larry Zamick, Pieter Van Isacker