/usr/lib/pd/extra/ is in pd-tclpd 0.3.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/pd/extra/tclpd/
/usr/lib/pd/extra/tclpd/examples/
/usr/lib/pd/extra/tclpd/examples/bitmap-help.pd
/usr/lib/pd/extra/tclpd/examples/bitmap-madness.pd
/usr/lib/pd/extra/tclpd/examples/bitmap.tcl
/usr/lib/pd/extra/tclpd/examples/colorpicker.tcl
/usr/lib/pd/extra/tclpd/examples/dynreceive-help.pd
/usr/lib/pd/extra/tclpd/examples/dynreceive.tcl
/usr/lib/pd/extra/tclpd/examples/dynroute-help.pd
/usr/lib/pd/extra/tclpd/examples/dynroute.tcl
/usr/lib/pd/extra/tclpd/examples/list_change-help.pd
/usr/lib/pd/extra/tclpd/examples/list_change.tcl
/usr/lib/pd/extra/tclpd/examples/properties.tcl
/usr/lib/pd/extra/tclpd/examples/slider2-help.pd
/usr/lib/pd/extra/tclpd/examples/slider2.tcl
/usr/lib/pd/extra/tclpd/tclpd-help.pd
/usr/lib/pd/extra/tclpd/tclpd-meta.pd
/usr/lib/pd/extra/tclpd/tclpd.pd_linux
/usr/lib/pd/extra/tclpd/tclpd.tcl