Test cases for concentric.
sdr> /program=Program.C2
C2
sdr> /// when ending in 1x4, only one reasonable reassembly ////////////
sdr> heads right and left thru twice
| 4B>  3Gv  3Bv  2G<
| 
| 4G>  1B^  1G^  2B<
sdr> centers run and roll
| 3G>  4B>  2G<  3B<
| 
| 1B>  4G>  2B<  1G<
sdr> concentric pass the ocean
| 1G^  3Bv  2B^  2Gv  4G^  4Bv  1B^  3Gv
sdr> hinge and roll
| 1Gv  2Bv  4Gv  1Bv
| 
| 3B^  2G^  4B^  3G^
sdr> concentric pass the ocean
| 3B>
| 
| 3G<
| 
| 2G>
| 
| 4B<
| 
| 2B>
| 
| 4G<
| 
| 1G>
| 
| 1B<
sdr> /// XXX test diamonds
sdr> /// lines to lines, columns to columns ////////////////////
sdr> hinge
| 3G^  3Bv
| 
| 4B^  2Gv
| 
| 4G^  2Bv
| 
| 1B^  1Gv
sdr> concentric walk and dodge
| 1B^  3G^
| 
| 4G^  4B^
| 
| 2Bv  2Gv
| 
| 1Gv  3Bv
sdr> /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> veer left
| 4B>  1B>
| 
| 4G>  1G>
| 
| 3G<  2G<
| 
| 3B<  2B<
sdr> concentric walk and dodge
| 3B<  4B>
| 
| 3G<  4G>
| 
| 2G<  1G>
| 
| 2B<  1B>
sdr> /// here lines-to-lines ends up in an opposite elongation
sdr> concentric partner tag
| 2B^  2G^  1G^  1B^
| 
| 3Bv  3Gv  4Gv  4Bv
sdr> bend the line
| 2B>  1B<
| 
| 2G>  1G<
| 
| 3G>  4G<
| 
| 3B>  4B<
sdr> touch 1/4
| 1B^  2Bv
| 
| 1G^  2Gv
| 
| 4G^  3Gv
| 
| 4B^  3Bv
sdr> concentric partner tag
| 2B<  2G<  1G>  1B>
| 
| 3B<  3G<  4G>  4B>
sdr> /// opposite elognation rule //////////////////
sdr> /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 ; fan the top
| 3B^  4Gv  3G^  4Bv  2B^  1Gv  2G^  1Bv
sdr> concentric recycle
| 4Gv  3Bv
| 
| 4Bv  3Gv
| 
| 1G^  2B^
| 
| 1B^  2G^
sdr> face right
| 4G<  3B<
| 
| 4B<  3G<
| 
| 1G>  2B>
| 
| 1B>  2G>
sdr> fan the top
| 4Gv  1Gv  4B^  1B^  3Bv  2Bv  3G^  2G^
sdr> concentric bend the line
| 1G>  2G<
| 
| 4B>  3B<
| 
| 1B>  2B<
| 
| 4G>  3G<
sdr> /exit