From a small tripleton, third hand would play the middle card (i.e. the second-highest card), followed by the highest card and then the lowest. Playing low-high shows an odd number of cards, a la MUD.
From a four-card holding, third hand would play his second-highest card, followed by the third-highest card. Playing high-low shows an even number of cards, as in standard count signals.
The Foster Echo is named for its inventor, the late American card player and writer Robert Frederick Foster.
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