6 T A B B E D P L A N K S

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Because this puzzle is made of clear acrylic, I have given colors to the pieces for easier ability of following the steps throughout this solution.
All the steps show the pieces being assembled from the top view .

2.    Place B on top of A, tabs facing away from you, left end facing left, and pull towards you to seat the near A tab in the near notch of B.

3.    Hold C vertically, tabs facing right, with left end downward.
       Seat C's notch over B's left tab and pull C to the left until it stops against the tab.

4.    Hold D vertically, tabs facing left, with right end downward. Seat D's slot over B's right tab and pull D to the
       right until it stops against the tab.

5.    Place E on top of A, tabs facing towards you, left end facing right, seating A's far tab into E's slot.
       Push E away from you until it stops against the tab.

6.    With your left hand, hold F with tabs pointing downward, left end towards you, and lower it between C and D.

7a.    With your right hand, push D left, seating D's tabs into both F and A (not in view).

7b.    Then pull E towards you , seating E into D.

7c.    Now push F down to seat it . . . . .

7d.    and finally push C in to complete the assembly.