|How to Juggle|
In his turn a player may first pick up one card from the playing table and then discard one from his hand onto the table. The card picked up may be the top card of either the red or black deck, or it may be a card which has been previously discarded (not possible until cards are discarded). The card discarded may be the same one which the player just picked up, in which case his hand is unchanged by his turn.
Each discarded card is placed face up in an empty space on the table, so that the table gradually fills up with cards. Any of these discarded cards is available for any player to subsequently pick up on his turn, so the players have a wider choice of letters as the round progresses (you could even pick up one which you discarded yourself earlier).
Note that you needn’t always have seven cards in your hand. Discarding is optional; you may keep all the cards and increase the size of your hand if you wish (therefore you can build longer words). Similarly, picking up is also optional; by choosing not to pick up a card and just discarding, you can reduce the size of your hand. This may enable you to declare a shorter word.