_θbc_θbc_θb_θb,_θba_θb;_θb_θb_θb_θb._θb_θb_θb,_θb!_θb:_θbA_θba_θbB_θb_θb_θb_θb_θb;_θbc_θb:_θb_θb?_θb,_θb_θbA_θb_θb_θb,_θba_θb,_θb_θbc_θb_θb_θb_θb?_θbB_θb!_θb;_θb?_θb._θbA_θb_θb_θbA_θb?_θba_θb_θbB_θb_θbc_θbB_θb._θb;_θb_θbA_θba_θb!_θb:_θbc_θb_θb!_θb:_θb!_θb_θb_θbc_θb_θb,_θbB_θb_θbA_θb_θb_θb:_θb_θb_θbc_θb_θbA_θbB_θb_θbA_θbB_θb_θb;_θb_θb._θb_θb_θb_θb_θb_θb:_θb_θb