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P`+ab1 6 yz6\ruCuCMj|uuC>op62 u\rStringbulder:efvN!O6P:\rstring6*** (`M,[(p++\r IndexOf LastlndexOf Contains(+ Starts With EndWith\rf (P:+ Concat Join\r Substring Split\r Pad Left PadRigth\rc¡ Trim TrimStar TrimEnd\rr` Insert (¢£+WRemove (¤¥+ Replace (¦§+\r¡*0?String.Format\r¨?©ª?Tollpper Tolower\r«c¬DcN!IsNullOrEmpty\rstring str2=null M%P:\rstring str2 = " " %>P:\rN!ODN!6l®¯\rA>N!O`°±²]³p´µ.\r¶·¸¹\rpr i vate static i nt Sum (i nt n) ÉÊ˶·¸¹\rif (n <= 1)\r(\rreturn 1;\r}\rreturn (Sum (n-2) +Sum(n-1));\r)