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oi -- Option Indent
default range syntax
1, $ oi[a | <indent>]
"oi" selects the indent value for lines inserted with "a" and
"i" commands (initially 1). "a" selects auto-indent which sets
the indent to the value which equals the indent of the previ-
ous line. If neither "a" nor "<indent>" is specified, the
current value of indent is displayed.
For general information about the option command, type "ho".