ex-gratia: as a favor : done by government when someone dies of train or public accident.Gratis=free but without that accident happening,just for ur gratification.Gratuity iis also free,for service provided =TIP.
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g+rat+is => rat is free
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gratis= grant + is , grant from govt. is free
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read last three words "tis" as "tip " so tip always given freely
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Great Ass....If an ass is available for free its great