[r-t] Extent of Double Grandsire Doubles

[James Ramsbottom]

Hello All

Is it possible to get a single extent (i.e. 120 true changes) of Double
Grandsire Doubles using only standard Grandsire calls? If not, is there a
120 which almost meets the criteria e.g. has only 2 special lead-end calls?
(Someone asked on a Facebook group and I'm now interested to know myself.)

James
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