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DS-1000 / 236 / I have the following dataframe:

Problem

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prompt

Problem:
I have the following dataframe:
  text
1 "abc" 
2 "def" 
3 "ghi"
4 "jkl" 


How can I merge these rows into a dataframe with a single row like the following one Series?
0    jkl-ghi-def-abc
Name: text, dtype: object

A:
<code>
import pandas as pd


df = pd.DataFrame({'text': ['abc', 'def', 'ghi', 'jkl']})
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Pandas

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Source and history

upstream_id / Original problem ID
236
task_id
e856ada9-0fe7-5aa4-b550-c523feaa62c5
task_key
default--test--236
task_revision_id
1
config / split
default / test

Official source

initial import