不知道问题出在哪，大神看下

model:
sets:
person/1..5/;
position/1..4/;
link(person,position):c,x;
endsets
data:
c=66.8,75.6,87,58.6
57.2,66,66.4,53
78,67.8,84.6,59.4
70,74.2,69.6,57.2
67.4,71,83.8,62.4;
enddata
min=@sum(link:c*x);
@for(person(i):@sum(position(j):x(i,j))<=1;);
@for(position(j):@sum(person(i):x(i,j))=1;)
@for(link(i):@bin(x(i))); ！（就是这里有问题）
end
问题代码11 模型中的语句出现了语法错误(不符合LINGO语法)
大家帮忙看下~谢谢