diff --git a/Yavsc/Controllers/FrontOfficeController.cs b/Yavsc/Controllers/FrontOfficeController.cs
index 70f18539..e9efd1c9 100644
--- a/Yavsc/Controllers/FrontOfficeController.cs
+++ b/Yavsc/Controllers/FrontOfficeController.cs
@@ -52,10 +52,13 @@ namespace Yavsc.Controllers
             {
                 throw new NotImplementedException("No Activity code");
             }
-            ViewBag.Activity = _context.Activities.FirstOrDefault(a=>a.Code == id);
-           var result = _context.Performers
-           .Include(p=>p.Performer).Where(p => p.Activity.Any(u=>u.DoesCode==id)).OrderBy( x => x.MinDailyCost );
-           
+           ViewBag.Activity = _context.Activities.FirstOrDefault(a=>a.Code == id);
+          var result = _context.Performers
+           .Include(p=>p.Activity)
+           .Include(p=>p.Performer)
+           .Include(p=>p.Performer.Posts)
+           .Include(p=>p.Performer.Devices)
+           .Where(p => p.Active && p.Activity.Any(u=>u.DoesCode==id)).OrderBy( x => x.Rate ).ToList(); 
             return View(result);
         }
 
diff --git a/Yavsc/Controllers/ManageController.cs b/Yavsc/Controllers/ManageController.cs
index b533399b..fa71b0b5 100644
--- a/Yavsc/Controllers/ManageController.cs
+++ b/Yavsc/Controllers/ManageController.cs
@@ -491,8 +491,11 @@ namespace Yavsc.Controllers
         {
             var user = GetCurrentUserAsync().Result;
             var uid = user.Id;
-            var existing = _dbContext.Performers.Include(x => x.OrganizationAddress)
-            .Include(p=>p.Activity).FirstOrDefault(x => x.PerformerId == uid);
+            var existing = _dbContext.Performers
+            .Include(p=>p.Performer)
+            .Include(x => x.OrganizationAddress)
+            .Include(p=>p.Activity)
+            .FirstOrDefault(x => x.PerformerId == uid);
 
             ViewBag.GoogleSettings = _googleSettings;
             if (existing!=null)
diff --git a/Yavsc/Migrations/ApplicationDbContextModelSnapshot.cs b/Yavsc/Migrations/ApplicationDbContextModelSnapshot.cs
index 2e02ba6d..d37b7a5c 100644
--- a/Yavsc/Migrations/ApplicationDbContextModelSnapshot.cs
+++ b/Yavsc/Migrations/ApplicationDbContextModelSnapshot.cs
@@ -1,6 +1,8 @@
 using System;
 using Microsoft.Data.Entity;
 using Microsoft.Data.Entity.Infrastructure;
+using Microsoft.Data.Entity.Metadata;
+using Microsoft.Data.Entity.Migrations;
 using Yavsc.Models;
 
 namespace Yavsc.Migrations
diff --git a/Yavsc/Models/IT/Modeling/Code.cs b/Yavsc/Models/IT/Modeling/Code.cs
new file mode 100644
index 00000000..3dc54117
--- /dev/null
+++ b/Yavsc/Models/IT/Modeling/Code.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using YavscLib;
+
+namespace Yavsc.Models.IT.Modeling
+{
+    public abstract class Code<TLetter> : ICode<TLetter> where TLetter : ILetter<TLetter>
+    {
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            throw new NotImplementedException();
+        }
+
+        /// <summary>
+        /// !a Count^3 task len
+        /// </summary>
+        /// <returns></returns>
+        public bool Validate()
+        {
+            foreach  (var letter in this) {
+                    var word = this.CreateWord(letter);
+                foreach  (var other in this) {
+                    IWord<TLetter> first = word.Aggregate(other);
+                    foreach  (var tierce in this)
+                    {
+                        var otherword = word.Aggregate(tierce);
+                        if (first.Equals(otherword))
+                            return false;
+                    }
+                }
+            }
+            return true;
+        }
+
+        public abstract IEnumerator<TLetter> GetEnumerator();
+
+        public abstract IWord<TLetter> CreateWord(TLetter letter);
+    }
+}
\ No newline at end of file
diff --git a/Yavsc/Models/IT/Modeling/Letter.cs b/Yavsc/Models/IT/Modeling/Letter.cs
new file mode 100644
index 00000000..770c1031
--- /dev/null
+++ b/Yavsc/Models/IT/Modeling/Letter.cs
@@ -0,0 +1,16 @@
+
+using YavscLib;
+
+namespace Yavsc.Models.IT.Modeling
+{
+    public abstract class Letter<T> : ILetter<T>
+    {
+        public abstract bool Equals(T x, T y);
+
+        public int GetHashCode(T obj)
+        {
+            return obj.GetHashCode();
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/Yavsc/Models/Workflow/PerformerProfile.cs b/Yavsc/Models/Workflow/PerformerProfile.cs
index 9c2b0bd8..dcbc34ab 100644
--- a/Yavsc/Models/Workflow/PerformerProfile.cs
+++ b/Yavsc/Models/Workflow/PerformerProfile.cs
@@ -10,7 +10,7 @@ namespace Yavsc.Models.Workflow
 
         [Key]
         public string PerformerId { get; set; }
-        [ForeignKey("PerformerId"),Display(Name="Performer")]
+        [ForeignKey("PerformerId")]
         public virtual ApplicationUser Performer { get; set; }
 
         [InverseProperty("User")]
diff --git a/Yavsc/Views/FrontOffice/Book.cshtml b/Yavsc/Views/FrontOffice/Book.cshtml
index 33a8c4aa..ee399d0a 100644
--- a/Yavsc/Views/FrontOffice/Book.cshtml
+++ b/Yavsc/Views/FrontOffice/Book.cshtml
@@ -1,5 +1,5 @@
- @model IEnumerable<PerformerProfile>
- 
+@model IEnumerable<PerformerProfile>
+  
 @{
     ViewData["Title"] = "Book - " + (ViewBag.Activity?.Name ?? SR["Any"]);
 }
@@ -7,10 +7,11 @@
 
 @foreach (var profile in Model) {
     <hr/>
-    @Html.DisplayFor(m=>m)
+   @Html.DisplayFor(m=>m)
     <form action="~/Command/Create" >
         <input type="hidden" name="id" value="@profile.PerformerId" />
         <input type="hidden" name="activityCode" value="@ViewBag.Activity.Code" />
              <input type="submit" value="@SR["Book "+ViewBag.Activity.Code]"/>
-    </form>
+    </form> 
 }
+
diff --git a/Yavsc/Views/Shared/DisplayTemplates/ApplicationUser.cshtml b/Yavsc/Views/Shared/DisplayTemplates/ApplicationUser.cshtml
index dd5654e0..da570bfe 100644
--- a/Yavsc/Views/Shared/DisplayTemplates/ApplicationUser.cshtml
+++ b/Yavsc/Views/Shared/DisplayTemplates/ApplicationUser.cshtml
@@ -1,4 +1,5 @@
 @model ApplicationUser
+
 <img src="~/Avatars/@(Model.UserName).xs.png" alt="avatar"> 
 @Model.UserName 
      <ul>
@@ -18,5 +19,4 @@ asp-route-id="@Model.UserName">@SR["His blog"]</a>
 <li>   @SR["Uses the mobile application, and receives push notifications"]
 </li>
     }
-     </ul>
-
+</ul>
diff --git a/Yavsc/Views/Shared/DisplayTemplates/PerformerProfile.cshtml b/Yavsc/Views/Shared/DisplayTemplates/PerformerProfile.cshtml
index 7be85db3..228e8a2b 100644
--- a/Yavsc/Views/Shared/DisplayTemplates/PerformerProfile.cshtml
+++ b/Yavsc/Views/Shared/DisplayTemplates/PerformerProfile.cshtml
@@ -1,7 +1,6 @@
 @model PerformerProfile
 
 <div class="performer @(Model.Active?"active":"inactive")">
-     
      @Html.DisplayFor(m=>m.Performer)
 
      <ul>
diff --git a/Yavsc/Views/Shared/PerformerProfile.cshtml b/Yavsc/Views/Shared/PerformerProfile.cshtml
deleted file mode 100644
index dccb92aa..00000000
--- a/Yavsc/Views/Shared/PerformerProfile.cshtml
+++ /dev/null
@@ -1,42 +0,0 @@
-@model PerformerProfile
-
-<div class="performer @(Model.Active?"active":"inactive")">
-     @if (Model.Performer != null) {
-    @if (Model.Performer.Avatar != null) {
-               <img src="~/Avatars/@Model.Performer.Avatar" alt="avatar"> 
-         }
-             @Model.Performer.UserName 
-
-     <ul>
-         
-         <li> @SR["Rating"]: @Model.Rate % </li>
-        @if (Model.MinDailyCost != null) {
-            <li>@SR["MinDailyCost"]: @Model.MinDailyCost&euro;</li>
-        }
-        @if (Model.MinDailyCost != null) {
-            <li>@SR["MaxDailyCost"]: @Model.MaxDailyCost&euro;</li>
-        }
-        @if (Model.WebSite!=null) { 
-            <li>@SR["WebSite"]: @Model.WebSite</li>
-        }
-        @if (Model.DoesBlog) {
-            <li>  <a asp-controller="Blogspot" asp-action="UserPosts" 
-            asp-route-id="@Model.Performer.UserName">@SR["His blog"]</a>
-            </li>
-        }
-        @if (!string.IsNullOrEmpty(
-            Model.Performer.DedicatedGoogleCalendar))
-            {
-            <li>   @SR["Exposes his Google calendar!"]
-            </li>
-            }
-        @if (Model.Performer.Devices?.Count>0)
-            {
-            <li>   @SR["Uses the mobile application, and receives push notifications"]
-            </li>
-            }
-
-    </ul>
-   
-     }
-</div>
diff --git a/YavscLib/ICode.cs b/YavscLib/ICode.cs
new file mode 100644
index 00000000..25cf54ab
--- /dev/null
+++ b/YavscLib/ICode.cs
@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+
+namespace YavscLib
+{
+    public interface ILetter<T> : IEqualityComparer<T> {
+    }
+    public interface IWord<TLetter> where TLetter : ILetter<TLetter>
+    {
+        IWord<TLetter> Aggregate(TLetter other);
+    }
+
+    public interface ICode<TLetter> : IEnumerable<TLetter> where TLetter : ILetter<TLetter>
+    {
+        /// <summary>
+        /// Checks that (b!=c) => a.b != a.c
+        /// </summary>
+        /// <returns></returns>
+        bool Validate();
+
+        IWord<TLetter> CreateWord(TLetter letter);
+    }
+}
\ No newline at end of file