Characters allowed between in operator

1337	in	alert(9)

1337
in
alert(10)

1337inalert(11)

1337inalert(12)

1337
in
alert(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)