ha2=11 (school)
bitarray

=========       ====================================        ====================================
hb1             ha1=247 --> STARLING MEDICAL COLLEGE         ha1=127 --> LEONARD MEDICAL SCHOOL
                    387                                          310
=========       ====================================        ====================================
0000000         0                                              0
0000001         0                                              0
0000002         0                                              0
.
.
0087280         0                                              1
.
0156874         0                                              1
0156875         0                                              1
.
0392949         0                                              1
0393950         0                                              1
.
0450807         0                                              1
.
2045787         1                                              0
.
2148608         1                                              0
2148609         1                                              0
2148610         0                                              0
2148611         1                                              0
2148612         1                                              0
.
.
2726838         0                                              1    (Filtered with graduated>2015)
2726839         0                                              1    (Filtered with graduated>2015)
.
.
2780184         0                                              0

