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function(t,e,r){"use strict";var n=r(611122).notEmptyKey;function i(t,e){return n(e)&&"MUTABLE"===t.__get(e).getMutability()?e:null}t.exports=function(t,e){if(e.isCollapsed()){var r,n=e.getAnchorKey(),o=e.getAnchorOffset();return o>0?(r=t.getBlockForKey(n).getEntityAt(o-1))!==t.getBlockForKey(n).getEntityAt(o)?null:i(t.getEntityMap(),r):null}var a=e.getStartKey(),s=e.getStartOffset(),u=t.getBlockForKey(a);return r=s===u.getLength()?null:u.getEntityAt(s),i(t.getEntityMap(),r)}}