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\ExplSyntaxOn \cs_new:Npn \mypkg_set:nn #1#2 { \tl_set:cn {#1} {#2} } \cs_new:Npn \mypkg_cond:nTF #1 { \bool_if:nTF {#1} { \mypkg_yes: } { \mypkg_no: } } \ExplSyntaxOff