Hi there.  It's the first time I'm writing a Pokemon TCG tip.  We all know how Lass and Cleffa form a powerful combo,  and can win you the game if you get the flip and play them first turn.  However, I was a little skeptical about the actual probability of getting a Lass and a Cleffa first turn to actually do the combo.  Of course, for the combo to work, you also need an energy card to attach to Cleffa.  So I tried to work out the probability of getting a Lass, Cleffa and energy card at the start of the game.  Here are the results.  The numbers of the three tables below indicate the following: if the number for a deck with 8 energies, 2 Lass and 2 Cleffa is 36 (refer to table below), then one initial hand out of 36 will contain at least one cleffa, one lass and one energy card.
 
With 8 Energies in the deck:
 
         # L a s s
#      1   2   3   4
C  .----------------
l 1| 157  76  49  35
e 2|  76  36  23  17
f 3|  49  23  15  11
f 4|  35  17  11   8
a
 
With 14 energies in the deck:
 
         # L a s s
#      1   2   3   4
C  .----------------
l 1| 110  53  34  25
e 2|  53  26  16  12
f 3|  34  16  11   8
f 4|  25  12   8   6
a
 
With 20 energies in the deck:
 
         # L a s s
#      1   2   3   4
C  .----------------
l 1|  95  45  29  21
e 2|  45  22  14  10
f 3|  29  14   9   6
f 4|  21  10   6   5
a
 
Let's consider a deck with 3 Lass, 3 Cleffas and 14 energies.  Then out of every 11 initial hands, 1 of them contains a Lass, a Cleffa and an energy... not bad at all, considering that we didn't account for cards such as Computer Search, Professor Oak, etc. that will enhance the odds even further.  From the above tables we note that the amount of energy cards in the deck is of very great importance for the success of the first turn Lass/Eeeeeeek combo... much more important than I imagined.  Also, I reaffirmed what we all know: that many single cards in a deck are bad.  Looking at the tables above, if the deck has a single Cleffa and/or a single Lass, the odds are very unfavourable, even if you have 20 energies in the deck.
 
Hope this study was of some help to all of you.
 
Alexander Farrugia