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    s/(M)|D/4x@-x5/eg,s/C4//,$\=y/LXVIC4/DCLXM/for(<>)x3;print
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    y/DCLXVIM /4 DCLX9/,$\=s/( )?\d/9x($&+!$1)/egfor(<>)x4;print
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    s/M2//,y/DCLXVIM/1MDCLX2/,$\=s/\d/2x$&x5/egfor(<>)x4;print