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

.silent_index {M-Backspace} idx 14-1
.silent_index {C-X} idx 14-1
.silent_index {C-T} idx 14-1
.silent_index {C-X} idx 14-2
.silent_index {C-X} idx 14-2
.silent_index {M--} idx 14-2
.silent_index {M--} idx 14-2
.silent_index {M--} idx 14-2
.silent_index {M-L} idx 14-2
.silent_index {M-U} idx 14-2
.silent_index {M-C} idx 14-2
.silent_index {M-'} idx 14-2