/Russian PPs/
/start/
pp;

/rules/
:: =d +k[case:] =p< pp;
[r:in] :: p[case:loc];
[r:this,num:,gender:,case:] :: =n[case:]< d -k<;
[r:box,num:sg,gender:f,case:] :: n[num:sg,gender:f]<;

:: =n[case:]< =a[num:,gender:,case:] n[num:,gender:]<;
[r:big,num:,gender:,case:] :: a<;