str_char
(String,Char) (string,char) (i,o) (o,i)
str_int
(String,Int) (string,integer) (i,o) (o,i)
char_int
(Char,Int) (char,integer) (i,o) (o,i)
frontchar
(String,FrontChar,RestString) (string,char,string) (i,x,x)
(x,i,i)
fronttoken
(String,Token,Rest) (string,string,string) (i,o,o) (i,i,o)
(o,i,i)
prologtoken
(String,Token,Rest) (string,string,string) (i,o,o) (i,i,o)
(o,i,i)
isname
(String) (string) (i)
concat
(Str1,Str2,ResStr) (string,string,string) (i,i,o)
str_len
(String,Length) (string,integer) (i,o)
frontstr
(StrLen,String,FrontStr,RestStr) (i,i,o,o)