:sparkles: blocking seen letters

vue-theme/src/pages/list.vue

             width: 100%
             &.inbetween
                 grid-column: span 3
+                background: white
+                padding: 0.3em 0
+                font-size: 1.3em
+                > p
+                    margin: 0
 
     /* posts in grid list */
     .posts.is-grid

vue-theme/src/store/modules/artist.js

 }
 
 let seen = 0
+let hasTitle = []
 const _arrangeByAlpha = artistsList => {
     const alphabet = [...'9abcdefghijklmnopqrstuvwxyz']
     const flatPacked = []
         if(i == 0) {
             seen = charaIndex
             flatPacked.push({ slug: alphabet[seen], title: alphabet[seen], inbetween: true })
+            hasTitle.push(alphabet[seen])
         }
 
         if (charaIndex == seen + 1) {
             seen++
             if(seen > alphabet.length) { seen = 0 }
-
-            flatPacked.push({ slug: alphabet[seen], title: alphabet[seen], inbetween: true })
+            
+            if(!hasTitle.includes(alphabet[seen])) {
+                flatPacked.push({ slug: alphabet[seen], title: alphabet[seen], inbetween: true })
+                hasTitle.push(alphabet[seen])
+            }
         }
         flatPacked.push(artist)
     })