Actually, you don't want to use squares. or even rectangular pieces. Irregular pieces work best. The idea is to not have any parallel running seams like you would get with same sided pieces. That way there's no weak spots, I know we're getting picky, but the very best way is curved pieces, (like the curves in the letter "S"). They are the strongest.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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