Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| First TOPS | Second TOPS | First TOPS | Second TOPS | First TOPS | Second TOPS | First TOPS | Second TOPS |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 102 | 101 | 106 | 105 | 140 | 104 | 141 | 105 |
| 142 | 108 | 143 | 100 | 144 | 101 | 145 | 103 |
| 146 | 109 | 147 | 111 | 148 | 114 | 149 | 121 |
| 150 | 122 | 160 | 104 | 161 | 107 & 108 | 162 | 101 |
| 163 | 110 | 164 | 101 | 165 | 111 | 166 | 104 |
| 167 | 108 | 168 | 101 & 111 | 169 | 104 | 170 | 105 |
| 171 | 101 | 172 | 116 | 173 | 115 | 174 | 118 |
| 175 | 116 | 176 | 117 | 177 | 115 | 178 | 119 |
| 179 | 120 | 180 | 124 | 181 | 124 | 182 | 123 |
| 183 | 123 | 184 | 123 | 185 | 125 | 186 | 127 |
| 187 | 126 | 188 | 126 | 189 | 126 | 190 | 130 |
| 201/1 | 201 | 201/2 | 202 | 201/3 | 203 | 202/1 | 206 |
| 202/2 | 207 | 202/3 | 205 | 203 | 204 | 211/1 | 206 |
| 211/2 | 207 | 211/3 | 205 | 212 | 204 | 221/1 | 201 |
| 221/2 | 202 | 221/3 | 203 | 222/1 | 206 | 222/2 | 205 |
| 223/1 | 201 | 223/2 | 202 | 223/3 | 203 | 224 | 207 |
| 225 | 203 | 261 | 251 |  |  |  |  |
Question:
what is the number of second tops listed in the column header?
Answer:
4