...,a!,.
+ ------ ,a a, ,a ,!@aa,. .,at@a, --------- @a,. ---- + t. , , , a@!a, @
@@ @aa,a,!
,a@a, @aa,
.,t ,!..,a, ,,!@ .,@
+ ---- ,t@a@ ------------------- ------xyfer- + @