Only extend from a quarter tag should be allowed below plus. sdr> /program = "BASIC" ; 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 * Invalid formation (1/4 TAG (RH 1/4 TAG(no matches), LH 1/4 TAG(no matches)), ANY (Not allowed below Plus)) sdr> /program = "MAINSTREAM" MAINSTREAM sdr> extend * Invalid formation (1/4 TAG (RH 1/4 TAG(no matches), LH 1/4 TAG(no matches)), ANY (Not allowed below Plus)) sdr> do half of a pass thru | 4B> 1B> | | 3G< 2G< | | 4G> 1G> | | 3B< 2B< sdr> extend * Invalid formation (1/4 TAG (RH 1/4 TAG(no matches), LH 1/4 TAG(no matches)), ANY (Not allowed below Plus)) sdr> /program = "BASIC" BASIC sdr> extend * Invalid formation (1/4 TAG (RH 1/4 TAG(no matches), LH 1/4 TAG(no matches)), ANY (Not allowed below Plus)) sdr> /program = "PLUS"; PLUS sdr> extend ; u turn back | 4B< | | 3G> 2G> 1B< | | 3B> 4G< 1G< | | 2B> sdr> /program="BASIC"; BASIC sdr> extend | 4B< 1B< | | 3G> 2G> | | 4G< 1G< | | 3B> 2B> sdr> /exit