🚀 go-pugleaf

I have a problem with TeX that probably is easy to a TeXpert:
I get tex output from a filter that looks like this:

\srcvr {line 1 in column 1
line 2 in column 1
line 3 in column 1}
\rcvr {line 1 in column 2
line 2 in column 2}
\ctw {line 1 in column 3}
\receivers
some text after the tricky part

My problem is to design the macros \srcvr, \rcvr, \ctw and
\recivers to yield this:

line 1 in column 1	line 1 in column 2	line 1 in column 3
line 2 in column 1	line 2 in column 2
line 3 in column 1

some text after the tricky part

I've tried many different ways, but none seems to work.
If someone knows how to do this, please respond by mail.

		...!mcvax!enea!erix!toni