s := "x" ----> "x"
s <<:= "x" ----> none
s ----> "x"
s := "x" ----> "x"
s <<:= "xx" ----> "xx"
s ----> "xx"
s := "x" ----> "x"
s <<:= "X" ----> none
s ----> "x"
s := "x" ----> "x"
s <<:= "abc" ----> none
s ----> "x"
s := "x" ----> "x"
s ~==:= "x" ----> none
s ----> "x"
s := "x" ----> "x"
s ~==:= "xx" ----> "xx"
s ----> "xx"
s := "x" ----> "x"
s ~==:= "X" ----> "X"
s ----> "X"
s := "x" ----> "x"
s ~==:= "abc" ----> "abc"
s ----> "abc"
s := "x" ----> "x"
s ?:= "x" ----> "x"
s ----> "x"
s := "x" ----> "x"
s ?:= "xx" ----> "xx"
s ----> "xx"
s := "x" ----> "x"
s ?:= "X" ----> "X"
s ----> "X"
s := "x" ----> "x"
s ?:= "abc" ----> "abc"
s ----> "abc"
s ?:= s ----> "abc"
Run-time error 205 at line 46 in expr50.icn
value out of range