A both corners equally empty, d = 0.165 
  n d_nec_declared d_suf_declared power_necessity power_sufficiency power_joint
 15          0.165          0.165            0.74              0.77        0.61
 30          0.165          0.165            0.98              0.97        0.96
 power_weakest_perm power_sum_perm
               0.93           0.89
               0.99           1.00

B one corner clearly empty, the other barely: d = 0.245 and 0.011 
  n d_nec_declared d_suf_declared power_necessity power_sufficiency power_joint
 15          0.245          0.011            0.57              0.25        0.21
 30          0.245          0.011            0.96              0.29        0.29
 power_weakest_perm power_sum_perm
               0.28           0.49
               0.41           0.92

C both corners moderately empty, d = 0.10 
  n d_nec_declared d_suf_declared power_necessity power_sufficiency power_joint
 15            0.1            0.1            0.41              0.43        0.26
 30            0.1            0.1            0.76              0.74        0.58
 power_weakest_perm power_sum_perm
               0.58           0.51
               0.94           0.92

Monte Carlo SE of a rate near 0.5 with 100 replications: about 0.05
