After appealing to the summoner's sense of brotherhood for fellows of the same trade, the demon promises that when the summoner comes to his country, "`Al shal be thyn, right as thou wolt desire'" (D.1395-1402), and upon exchanging "tricks of the trade," their pledge of goods becomes a sworn agreement, "`Taak thou thy part, what that men wol thee yive, / And I shal myn; thus may we bothe lyve'" (1531-32).
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