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- Pressing a 0-9 digit accumulates that digit into what is named
- the "modifier". That modifier affects the behavior of many
- keystokes described below. The modifier starts at zero, but
- most commands interpret a zero as a 1 so that they can have an
- effect.
-
- 'G' selects the block specified by the modifier as the current
- block. Any change madde to the previously selected block is
- saved beforehand.
-
- '[' and ']' advance the selected block by modifier.
-
- 'Return' resets the modifier
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