remove positions that are no longer valid
remove positions that are no longer valid

usc-isi-i2/usc-isi-i2.github.io,usc-isi-i2/usc-isi-i2.github.io,usc-isi-i2/usc-isi-i2.github.io,usc-isi-i2/usc-isi-i2.github.io