// RESULT: 1.2  //  = 1+(0.8*0+0.1*1+0.1*1)   
R=? [ (F "goal1") | (F "goal2") ]

// RESULT: 1.2
R=? [ X F ("goal1" | "goal2") ]

// RESULT: 1.2
R=? [ F X ("goal1" | "goal2") ]

// RESULT: 2
R=? [ X X ("goal1" | "goal2") ]

// RESULT: Infinity
R=? [ X X "goal2" ]

// RESULT: 118/90
R=? [ F "goal2" ]

// RESULT: 118/90
R=? [ (F "goal2") ]

// RESULT: 118/90
R=? [ s!=3 U "goal2" ]

// RESULT: Error:co-safe
R=? [ F G "goal1" ]

// RESULT: Error:co-safe
R=? [ F G "goal1" ]

// RESULT: Error:co-safe
R=? [ (G !"hazard")&(G F "goal1") ]