【必要】和【必须】（1 / 2）

PmMvPA2CgOOyguWogOWEmueJnOaMgOiYkeWQiOakruWHmue6uOSruuiJnOahsua2ueWMh+mUsOatr+iGveSMvO+Br+idv+SwnOWml+aml+aTquihv+SdnuagvOe1ruadgOKCgOOzhuWjp+igveS/m+a9g+i9g+mRiOaMvO+QuuaEteiXlue7jOWvmOaYv+ixkumvmOahrueNuOSMvO+RiOa+ieaxsOW+mumwm+WJnOagveScnuaCpuWcgOI+Yzw+Yy88DZ2A4oKA44C85Y245Lum55+55J+j6bu45Iy875+j6ZyU54OQ5bGI56+Y5p+c56C95JyA4pq875OB6b2n5pCQ5bml5byc54a65Iuc56a55I+w5bGS6Yy874el5bKb5ped5YC45I6Q5YCc5oyH6ZCt5Zib54mO5oOQ5Z2e5qC857Wu5j5jPD5jLzwNnYDigoDjg7/lhYvmqJTnjbjkrLvkoL3kjLzvmKLprpfpp6TliLnkgLvkr5jmjbjknIDimrzvhYXlpaHomb/lpYDmiI/ljLzvurrkpLjkhrrkmbvnkoDpoLzkqrvnhYPmop3pn7Toiormj4PlvaXlsbflqofosIjlhq/oj4TmiI/luaXljK7ltK/oPmM8PmMvPA2dgOKCgOONh+mluOSWpOW8oOaPg+W9peW0ueWKu+SvmOaqj+WMvO+0l+m2l+a1ruaAuOSimemPveSavOS9g+m0ueWPr+aWu+SMvO+GuuSFl+ebr+aBgOicgOKMvO+GuuSlgOaLueSJnOeDh+ezhuWjp+ifpOWztuixkumEmueateiMgei8heW2ruWRuuSonOWNieWLueS5peWMvO+0pOWHkeaHkeaTn+atuOWpuOY+Yzw+Yy88DYKA47m06K+N6LuM5be16I245Ji75Iy876iU55+k5Y245LGS6ZOf5q245am45q+Y5pS65Y2P5YC45Kys56a55I+w5bGS6Yy875+U55uL5rmJ56+Y5r2D6bq65KS45LCI5bOD5j5jPD5jLzwNnYDin7zvl5DlqYrlrrjlgabogJzpoL3kjLzvl5DljYfppbjknIDimrzvrpfpsJzlh4jls4Xlprnkj7DlsZLpPmM8PmMvPA2dgOKCgOOWu+SDv+WFi+a5gueJnOaRiOaMvO+GuuSFl+eflOefvOWfvOWRiOavmOaxsOWmgOKIueSAu+ShsuacgOKavO+0r+ijj+WAvOWTvOeTvOeMvO+dkumfv+ibuuSJnOaTn+atuOWpuOY+Yzw+Yy88DYKA45ii6Z2v6Lun56y96J2e5qC857Wu5p2A4p+8742H6aW45Ii55KOC6Yic5byc55G76Yi55I6A5oy874a65Ii55I6A5qC95JyA4j5jPD5jLzwNgoDjtKTluYLnuYLngJ3njJLlhJnpvYPoqo/ljLzviLnkgLvklK3nnpvlk4HppZ/njbjktI3ltJjloLzlhrrkoLzluaXljLzvi7jkgLjkhrrko4TmmL/ot7Xorpfpq6LotoTngarnjLzvpbLns7HnhJrnjIfpl6LngJ3nhLzlhZDmsJzlh4fpk4nmvrLnoJfmk5/mrbjlqbjmPmM8PmMvPA2dgOKfvO+vmOaNuOSvmOaMvO+0r+igveSMvO+Tn+aPsOWcgOKMvO+Gr+ixheWCsea7r+Wzg+aMvO+Tn+atuOWpuOaojuaGuuSojuaLieajgum5peWMvO+lgOamhOebuuSJnOadnuagvOe1ruaEmue3oeiOuuSoiuWgl+aAneeLnOemueSPsOWxkumdgOKCgOOnkOW9peWPveSNuOSPl+i9g+mPl+iirOacluWEmuegveS5r+WhuOaRuuSMvO+Yieaci+acgOI+Yzw+Yy88DZ2A4p+874i55IC75Imc5qm/5JGI5pe+5Ymn6Jq85Ii55IC75Lq45KC95Iy874qV5Ymc5qGy5r2D6Yi55IC75JyA4pq877Sk5YeR5oeR5oil5aCX5p2e5qC857Wu5j5jPD5jLzwNnYDin7zvhrrkt6DmiLnkjoDmjLzvobjmkbrkjJLlqaTlpLjkjYnloL3knIDijLzvrpfpsJzlh6XlvaXlm7rkiZzmprnkj7DlsZLpPmM8PmMvPA2CgOOFhuWCoOWfo+mMvO+ppOWMuuSsrOc+Yzw+Yy88DYKA44a65JmU6ayQ5bG35aqH6Lq45KW75IOQ54mF5bCI5bu96Iy877u96Ii+5bOf6bCj5T5jPD5jLzwNnYDigoDjsKPlgLjkkYjmia/oipHljLzvsaTliLbmjpDlpbvknIDimrzvsZjlro/lhJrnqIDmvLzkuY/lvLzksKPlgLjksIjlrJDljYnmg5DniYXljLzvhbnkiL7lhrrkh7/oPmM8PmMvPA2CgOOhneexsOW0pOWSgOWQreWrouiKuOSJi+aMvO+DruWGkOeNuOSsnOa5oOadnuagvOe1ruY+Yzw+Yy88DZ2A4oKA47i45aOt5p+55LmC54C45KC85reG5bq65Lmv5Yy877q65ISa54eB6beG5YyS5Zeq6bqs5reg5oSQ5Y2n54SQ5Ya65IeB6a2B6Y+w5Y675I2n55m/6KmP55Ov5rWC6Yy874Sa55eq6b2l5Yi55KOC6aG45pG65I+D5b2D6bq65Kq45I+v5q+Y5o245Iy877u45L+u5ZyA4pq875Sw5qqA5rOY6bSY6bCc5Yul5bSF5Zu65Imc5oOQ54mF5Yy876qY54OQ5bu45L+u5bCI5YeB6aGs5oC45Kys54+D5b2l5T5jPD5jLzwNnYDin7zvhJrnnL7morPmoJfmq6/mr5jmtI3lg7/lhYblr4/ljLzvt6Dmoajmj43mv4vmurrku7vkuITogJ3norrnr4nlgLjkhrrkuoflnL3ktoTnvZnopbvkgInmnIDijLzvkaznvaXlsIjln4TmnZ7moLznta7mPmM8PmMvPA2dgOIwlIDilIDiurjkvIDlj4TmsYjnjYnlk73lqY/nk6/mtYLpjLzvoq/opZ/mj7vnnIDiPmM8PmMvPA2dgOKmgOKcgOI+Yzw+Yy88DYKA45yK6JKN6IeJ54C45K+Y5pi/6I+D5b2l5byA5Y+E5rGI54Sa55a75Iy875mA5baX5oSa5zA3tKDnsoblvYPpvIDlj4TmsYjnurrklrvktoXlqJzljLzvkobpkI/mhJrnh43lirjkvIDlj4TmsYjnqY/nk6/mtYLph7/osIjlrJDliZzmobLmpZ3mjrvkj4PlvaXljIfpobHosI3lnZ7moLznta7mPmM8PmMvPA2dgOKCgOORsOWapOWvmOa8gOWPhOaxiOeEmuepj+eTr+a1gumMvO+gveSul+mul+mzg+aRiOacgOI+Yzw+Yy88DZ2A4p+875eQ5Yu65Ii55IC75Imc5ru45L+u5Yy875GI5r6J5p+757uz57u45JyA4pq875St556b5bCc5b2757Sg55245IC45Imc5qGy5oOu5Yy8746w6JKS5pq85LGw5Z+U56mk5YOQ54mF5Yy873ZuhJrnhJboobfmhq/oj4TmhYPmn4Tmurjkq7roPmM8PmMvPA2CgOOxpOWItuaVg+amreiEmueDruWpruiJnOahsua2ueWZv+ivj+WMvO+xpOWItuaDkOeJheWTgemln+eavOSIueSAu+S6uOSMvO+Kh+mjp+ijj+WAvOW5peU+Yzw+Yy88DZ2A4oKA47Of6bCj5aGy5qC95KuP5Y2J5pqI5ZGI5pyA4j5jPD5jLzwNgoDjlK3nnpvlopXmjbjkg5DniYXljLzvkK3lkYfphJrnkoDlu7/nr5jmj4PlkK3luJznhJrnsonogI/npZDnjI/lo4LpjLzvjIfptJfpv4jmhJrnkbvphrzmjLzvjIfpnKTlhJrnmZ3pgq/lqJzlPmM8PmMvPA2dgOKfvO+GuuSMh+mqk+W7juWgveScgOI+Yzw+Yy88DYKA46Kv6Ki06ISa57Of6bCj5aq45IC45LCI5ayQ5bGw5Yy874Ou5YSa55Sw5qOP5YC45Ia65JKI6JqI5T5jPD5jLzwNgoDjhrrkiY7mrZbmnLvnlIHohJrnn7vnu7Pnu7jkjrjkg67ljLzviY7mrZbmorPmtZTnPmM8PmMvPA2CgOOFg+aLuuSEmueDgOidgOalr+ifu+e7s+engOahrOaAuOSNp+eZv+iDruWvmOaNuOS9g+mbuuSZv+iHv+iNuOSMvO+Nk+WxveWwiOWXj+WavOSNuOSfueS7uOS/ruWMvO+9luaqjuaolOeHpOWGuuSolOeVgOaqk+WJp+ifhOatuOSLueSlhuWlhuWDruWMvO+avOSAuOSGuuSRluefv+iDkOeJheU+Yzw+Yy88DZ2A4oKA46eQ5b2W5qqO5qiU54ek5aq45KOC6ZaP5YeH6Y2G5Yy875mA5baX5oSa54qN5YC45Ie/6IW26KmJ57q65JKG6Ymn6Imt54y874a65Jeu55yA4j5jPD5jLzwNgoDjvIHmpovoiL7ljrnkvLzkn7vnu7Pnu7jknYDigoDjhKLpsrnljKHom7/oqYjlg53mobLmn7nkrLvkkYjmJTA2jrrkjr3kjLzvhrrkhbnkqqTlJTk1qJzlgYzmnb/kj7vnsrfljLzvoZ3mkobpiafohJrnu7jkv67lhJrnoL3kiZzmmL/onIDiPmM8PmMvPA2CgOO7s+ezheWrr+aduOSJnOahsua7uOS/ruWEmue5peWMkuWShumJp+iquOSquOSAuOShsei5r+WhiuW7u+SlneaLnOe8vOSMsuiMvO+KuOSruuidnuagvOe1ruaonOWNuOSYv+iPgeWPgeWYoumul+mvj+WMvO+lheW6h+WJnOaRkOWwteiEmueCseaBpuifu+e7s+e7uOSMkuWvmOaxsOWGveS7puePgeWJnOahsuaFg+anieWOmOaOmOaMvO+Ureeem+WIueSOgOaTgemln+eNuOSfueSDkOeJheU+Yzw+Yy88DZ2A4p+874u65J6b5Yi55I6A5ru45L+u5YSa56O06J+06KC95JyA4pq874OQ54mF5a6X6ai06J+757uz57u45D5jPD5jLzwNgoDjnaLpgoPntKTlpoTnhJrnmb/ljIDomZTppYrmhJrnhYPmp4nlurjkoJvltI3lg7/lrbjkn7vnu7PnhJrnqJzlgInmg5DniYXljLzvhrrktKTlh7/omZ3pia7lm7rkiZzmvYPpg7/lrbjkgrjloaDll77lvL3lqbjmhJrnjo3lgbnnnr/osbDljLzvio3lnKTlPmM8PmMvPA2dgOKCgOOlk+Wlk+WMvO+gveSisOiisOicgOKavO+0r+iwnOWar+ifnOeMvO+Fo+iqvOSOuOSHpOWymOmLuOS4jeWwnOWBp+iVveednuagvOe1ruaMvO+Jp+ifhOaEmueDv+WSiOi4gOmJruW5peWZu+emuOW9g+i9g+mMvO+ZgOW2l+aIueSAu+S6ruigl+a+vOaOmOa9luY+Yzw+Yy88DZ2A4oKA44a65LuO5Y245LGw5ZGI5oy877mC54C45IO/5YC85Ze+5amO54y874a65L2l5bGw5b2H5bev6ICC6ZGP5ay75IuP5Yuc5oSa56C95Jm756Gu56qP5aC95Iy874a65L2l5ZKO5omu5b2D6ZGI5pyA4j5jPD5jLzwNgoDjhYPmi7rkhJrnua/lvrTmrr3ouLjmt7XokI/mvrzmjpjmvZbmkZDlqIrlu7jkjLzvvpPpi4nmvaXltpTmnZ7moLznta7mPmM8