Smooth down the outliers in a sequence with a Lulu algorithm.

Input parameters:

1. Nm → Numbers to filter.
2. Rd → Filter width.
3. Pt → Filter pattern.
   •    L → Lower
   •    U → Upper
   •   LU → LowerUpper
   •   UL → UpperLower
   • LULU → LULU
   • ULUL → ULUL

Output parameters:

1. Sq → Filtered sequence.