Given an equation, represented by words on left side and the result on right side. You need to check if the equation is solvable under the following rules: Each character is decoded as one digit (0 - 9). Every pair of different characters they must map to different digits. Each words[i] and result are decoded as one number without leading zeros. Sum of numbers on left side (words) will equal to the number on right side (result). Return True if the equation is solvable otherwise return False. Example 1: Input: words = ["SEND","MORE"], result = "MONEY" Output: true Explanation: Map 'S'-> 9, 'E'->5, 'N'->6, 'D'->7, 'M'->1, 'O'->0, 'R'->8, 'Y'->'2' Such that: "SEND" + "MORE" = "MONEY" , 9567 + 1085 = 10652 Example 2: Input: words = ["SIX","SEVEN","SEVEN"], result = "TWENTY" Output: true Explanation: Map 'S'-> 6, 'I'->5, 'X'->0, 'E'->8, 'V'->7, 'N'->2, 'T'->1, 'W'->'3', 'Y'->4 Such that: "SIX" + "SEVEN" + "SEVEN" = "TWENTY" , 650 + 68782 + 68782 = 138214 Example 3: Input: words = ["THIS","IS","TOO"], result = "FUNNY" Output: true Example 4: Input: words = ["LEET","CODE"], result = "POINT" Output: false Constraints: 2 <= words.length <= 5 1 <= words[i].length, result.length <= 7 words[i], result contain only uppercase English letters. The number of different characters used in the expression is at most 10.