File psl-1983/3-1/doc/nmode/nm-files.key from the latest check-in

.silent_index {C-X} idx 15-1
.silent_index {C-G} idx 15-1
.silent_index {C-X} idx 15-1
.silent_index {M-~} idx 15-2
.silent_index {C-X} idx 15-2
.silent_index {M-X} idx 15-2
.silent_index {C-X} idx 15-3
.silent_index {M-X} idx 15-3
.silent_index {C-X} idx 15-3
.silent_index {M-X} idx 15-4
.silent_index {M-X} idx 15-4
.silent_index {M-X} idx 15-4
.silent_index {M-X} idx 15-4
.silent_index {M-X} idx 15-4
.silent_index {M-X} idx 15-4
.silent_index {M-X} idx 15-4