Dear mailing list,
let's suggest I have a data.frame full of annotation data. In the first
column I have Identifiers present in the data. In all other columns I have
another annotaion for this identifier column.
However, on some rows  there is no 1:1 mapping but let's say a 1:3 mapping
or something like this:

ID     Symbol
1     Bla
2     Foo
3     XYZ // xyz /// xyz01
4     abc

I want to "stretch" the line which has multiple annotation tags. I know I
can split it with "strsplit", this get's me here:

ID     Symbol
1     Bla
2     Foo
3     "XYZ" "xyz" "xyz01"
4     abc

But how can I get to this:

ID     Symbol
1     Bla
2     Foo
3     XYZ
3     xyz
3     xyz01
4     abc


Your help will be really appreciated!

Thanks in advance, Andreas

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