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Basic commands:

`C-o`- (
`ses-insert-row`

) `M-o`- (
`ses-insert-column`

) `C-k`- (
`ses-delete-row`

) `M-k`- (
`ses-delete-column`

) `w`- (
`ses-set-column-width`

) `TAB`- Moves point to the next rightward cell, or inserts a new column if
already at last cell on line, or inserts a new row if at endline
(
`ses-forward-or-insert`

). `C-j`- Linefeed inserts below the current row and moves to column A
(
`ses-append-row-jump-first-column`

).

Resizing the spreadsheet (unless you're just changing a column width) relocates all the cell-references in formulas so they still refer to the same cells. If a formula mentioned B1 and you insert a new first row, the formula will now mention B2.

If you delete a cell that a formula refers to, the cell-symbol is
deleted from the formula, so `(+ A1 B1 C1)`

after deleting the third
column becomes `(+ A1 B1)`

. In case this is not what you wanted:

`C-_``C-x u`- Undo previous action (
`(undo)`

).