Tricky half-of-a-cross-runs.

sdr> /program = Program.PLUS ; setFormation(Formation.SQUARED_SET)
|      3Gv  3Bv
| 
| 4B>            2G<
| 
| 4G>            2B<
| 
|      1B^  1G^
sdr> heads lead right
| 4B>  3G<  1B>  2G<
| 
| 4G>  3B<  1G>  2B<
sdr> extend
| 4B>  1B>
| 
| 3G<  2G<
| 
| 4G>  1G>
| 
| 3B<  2B<
sdr> fan the top
| 3B^  4Gv  3G^  4Bv  2B^  1Gv  2G^  1Bv
sdr> do half of an ends cross run
|      3B>            2B>
| 4Gv       3G^  1Gv       2G^
|      4B<            1B<
sdr> /// other direction, runners should still end up in center
sdr> /program = Program.PLUS ; setFormation(Formation.SQUARED_SET)
|      3Gv  3Bv
| 
| 4B>            2G<
| 
| 4G>            2B<
| 
|      1B^  1G^
sdr> heads lead right
| 4B>  3G<  1B>  2G<
| 
| 4G>  3B<  1G>  2B<
sdr> extend
| 4B>  1B>
| 
| 3G<  2G<
| 
| 4G>  1G>
| 
| 3B<  2B<
sdr> girls cross run
| 4G<  1G<
| 
| 4B>  1B>
| 
| 3B<  2B<
| 
| 3G>  2G>
sdr> do half of a everyone cross run
| 3B^  4Gv  3G^  4Bv  2B^  1Gv  2G^  1Bv
sdr> fan the top
| 3B>  2B>
| 
| 4G<  1G<
| 
| 3G>  2G>
| 
| 4B<  1B<
sdr> /// this isn't quite a diamond: the girls have breathed forward a bit
sdr> /// as they were run around.  xxx: fix me, someday?
sdr> do half of a boys cross run
|  4G<       1G<
| 
| 4B^  3Bv  1B^  2Bv
| 
|    3G>       2G>
sdr> /exit