/usr/share/hol88-2.02.19940316/contrib/ZET/ is in hol88-contrib-source 2.02.19940316-35.
This file is owned by root:root, with mode 0o755.
..
/usr/share/hol88-2.02.19940316/contrib/ZET/zet/
/usr/share/hol88-2.02.19940316/contrib/ZET/zet/Makefile
/usr/share/hol88-2.02.19940316/contrib/ZET/zet/mk_zet.ml
/usr/share/hol88-2.02.19940316/contrib/ZET/zet/zet.ml
/usr/share/hol88-2.02.19940316/contrib/ZET/zet/zet_ind.ml
/usr/share/hol88-2.02.19940316/contrib/ZET/zet/zet_tactics.ml
/usr/share/hol88-2.02.19940316/contrib/ZET/zet11/
/usr/share/hol88-2.02.19940316/contrib/ZET/zet11/Makefile
/usr/share/hol88-2.02.19940316/contrib/ZET/zet11/mk_zet.ml
/usr/share/hol88-2.02.19940316/contrib/ZET/zet11/zet.ml
/usr/share/hol88-2.02.19940316/contrib/ZET/zet11/zet_ind.ml
/usr/share/hol88-2.02.19940316/contrib/ZET/zet11/zet_tactics.ml