Step4
?￠èóμ?D??D·á′?
1??ü′ê￡o×ì°íì?óí?òì??é?á???ü?Déú￡???é?2?òaì??Tà??￡
?ú?ˉ×±?aê????°?í?é?èí?é?ò?2?′??à?￡è?1?ê±??3??￡μ??°￡?ó?èè???í?á?áà′??2áê???μ?′?2?￡??a′?è￥???ê?￡ì???ò???×ìèóμ?·?é?′??à￡?′óá?±??ò?D??í??¨?ù?è?￡?óò?μ?·???μ?′???μ??ú′?2??D??￡??áè???μ?′??′é?è￥ê???èóμ?ó?2??áóúì?óí???￡
×?oóμ??÷í?D?ìùê?￡o2?·áê?ê??ú??í·?ò??????μ?2?·?ê1ó?°×é??òò?é?????￡??áóDìááá??é?μ?D§1????￡