#lang brag

tA-program   : tA-start tA-blank tA-accept tA-state-set
tA-start     : "@" tA-state-id
tA-blank     : "%" tA-symbol
tA-accept    : "!" tA-state-id
tA-state-set : tA-state (tA-state)*
tA-state     : ":" tA-state-id tA-tran-set
tA-tran-set  : (tA-tran)* (NL)*
tA-tran      : tA-symbol "~" tA-symbol tA-dir tA-state-id (NL)*
tA-symbol    : TA-STRING
tA-state-id  : TA-STRING
tA-dir       : "<" | ">"