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      1 string(5)
      2 string(0.5)
      3 string(-0.5)
      4 string(true())
      5 string(false())
      6 string(12345678901234567890)
      7 string(-12345678901234567890)
      8 concat("titi","toto")
      9 concat("titi","toto","tata")
     10 concat("titi",'toto')
     11 concat("titi",'toto',"tata","last")
     12 starts-with("tititoto","titi")
     13 starts-with("tititoto","to")
     14 contains("tititototata","titi")
     15 contains("tititototata","toto")
     16 contains("tititototata","tata")
     17 contains("tititototata","tita")
     18 substring("12345",2,3)
     19 substring("12345",2)
     20 substring("12345",-4)
     21 substring("12345",3.4)
     22 substring("12345",3.6)
     23 substring("12345",1.5,2.6)
     24 substring("12345",2.2,2.2)
     25 substring("12345",0,3)
     26 substring("12345",-8,10)
     27 substring("12345",4,-10)
     28 substring("12345",0 div 0, 3)
     29 substring("12345",1, 0 div 0)
     30 substring("12345",1 div 0, 3)
     31 substring("12345",3,-1 div 0)
     32 substring("12345",-42, 1 div 0)
     33 substring("12345",-1 div 0, 1 div 0)
     34 substring("12345",-1 div 0,5)
     35 string-length("")
     36 string-length("titi")
     37