In the following figure, the square represents 'lemon', the circle represents 'sweet', the triangle represents 'fruits', the rectangle represents 'sour', and the hexagon represents 'oranges'. Find the number which represents lemon fruits that are sour but NOT sweet. 
The sequence of folding a piece of paper and the manner in which the folded paper has been cut is shown in the following figures. How would this paper look when unfolded? 
Two different positions of the same dice marked with the letters a, b, c, d, e and f are shown. Select the letter that will be on the face opposite to the face having the letter 'a'.