More promenade tests.

sdr> heads lead right ; veer left
| 4B>  1B>
| 
| 4G>  1G>
| 
| 3G<  2G<
| 
| 3B<  2B<
sdr> trade
| 4G<  1G<
| 
| 4B<  1B<
| 
| 3B>  2B>
| 
| 3G>  2G>
sdr> centers trade
| 4G<  1G<
| 
| 3B<  2B<
| 
| 4B>  1B>
| 
| 3G>  2G>
sdr> half sashay  
| 3B<  2B<
| 
| 4G<  1G<
| 
| 3G>  2G>
| 
| 4B>  1B>
sdr> /// promenade until a couple 1 dancer is a beau
sdr> promenade home
|      4Bv  3Gv
| 
| 2G>            3B<
| 
| 1B>            4G<
| 
|      1G^  2B^
sdr> /exit