4-wide construction patterns
3-Celled Well Patterns
000/000
OLL/OJJ
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OLJ/OJL
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OLZ/OJS
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OLT/OJT
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JOL/LOJ
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JOZ/LOS
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JOT/LOT
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JJO/LLO
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JJL/LLJ
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JZJ/LSL
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JZL/LSJ
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JZS/LSZ
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JZT/LST
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JZL/LSJ
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TTL/TTJ
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100/001
JOL/LOJ
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SL/ZJ
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011/110
ZLJ/SJL
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010/010
101/101
TLJ/TJL
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102/201
210/012
TSZ/TTS
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TSL/TZJ
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TZJ/TSL
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220/220
020/020
Avoid these if you do not want to waste an I tetromino.