Hledger periodic transaction every month except two

Is there any clean way of describing an hledger periodic transaction that occurs for 10 months of the year. I have a recurring payment that comes out every month except July and August. Is there any way of describing this in a single periodic rule?

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This is a companion discussion topic for the original entry at https://www.reddit.com/r/plaintextaccounting/comments/1avogbn/hledger_periodic_transaction_every_month_except/