Table:
text: List of TVB series (1998)
First line series
First line series
Airing_date English_title_Chinese_title Number_of_episodes Genre Official_website
12 Jan- 6 Feb A Tough Side of a Lady 花木蘭 20 Costume action Official website
9 Feb- 6 Mar A Place of One`s Own 大澳的天空 20 Modern drama Official website
9 Mar- 1 May Dark Tales II 聊齋(貳) 50 Costume drama Official website
4 May- 29 May As Sure As Fate 師奶強人 20 Modern drama Official website
1 Jun- 31 Jul The Duke of Mount Deer 鹿鼎記 45 Costume drama Official website
3 Aug- 4 Sep Old Time Buddy - To Catch a Thief 難兄難弟之神探李奇 25 Period drama Official website

Question: What is the lowest number of episodes among the TVB series (1998) first line series with an air date of January 12 to February 6?