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Plaid Cymru leader Leanne Wood says she will use the election to push for a "rebalancing of power and wealth" across the UK.
Ms Wood told the BBC's Andrew Marr Show "if you don't ask for something you don't get it".
Her party has refused to support a Conservative administration if there is a hung parliament after 7 May.
Ms Wood said Plaid Cymru had "a lot in common" with the SNP and the Green Party.
The Plaid leader also said while not "inevitable", an independent Wales "could very well happen".
Ms Wood said the political equation had changed when the Conservative, Labour and Liberal Democrat parties all promised to maintain the Barnett Formula in Scotland, which she said was unfair towards Wales.