SHN Column Type recursive pattern

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I was looking at the type IDs for the SHN editors and they appear to repeat after 15(0xF), that is excluding some types that i have not seen. That said, i have little experience with them.

uint typeid = dwTypeID % 0xF;

This is the structure i assumed:

        public const uint SHN_BYTE = 1;
        public const uint SHN_USHORT = 2;
        public const uint SHN_UINT = 3;
        public const uint SHN_UINT_UKN = 4;// I dont want to assume UInt64
        public const uint SHN_UTF8 = 5;
        public const uint SHN_UTF16 = 6;
        public const uint SHN_UTF32 = 7;
        public const uint SHN_UTF_UKN = 8;
        public const uint SHN_STRING_LEN = 9;
        public const uint SHN_STRING_GUESS = 10; // Assumption
        public const uint SHN_STRING = 11;
        public const uint SHN_SBYTE = 12;
        public const uint SHN_SHORT = 13;
        public const uint SHN_INT = 14;
        public const uint SHN_INT_UKN = 0; // 15 % 15 = 0

Example, Mod the following values by 0xF returns the same values

case 0x18:
    this.WriteString(w, (string)obj2, col.Lenght);
    break;

case 0x1a:
    this.WriteString(w, (string)obj2, -1);
    break;