Characters allowed between in operator
1337$[chr]in$[chr]log($[i])1337⟦09⟧in0x09alert(9)1337
in
alert(10)13370x0Bin0x0Balert(11)13370x0Cin0x0Calert(12)13370x0Din0x0Dalert(13)1337 in alert(32)1337 in alert(160)1337 in alert(5760)1337 in alert(8192)1337 in alert(8193)1337 in alert(8194)1337 in alert(8195)1337 in alert(8196)1337 in alert(8197)1337 in alert(8198)1337 in alert(8199)1337 in alert(8200)1337 in alert(8201)1337 in alert(8202)1337
in
alert(8232)