# I am the Watcher. I am your guide through this vast new twtiverse.
# 
# Usage:
#     https://watcher.sour.is/api/plain/users              View list of users and latest twt date.
#     https://watcher.sour.is/api/plain/twt                View all twts.
#     https://watcher.sour.is/api/plain/mentions?uri=:uri  View all mentions for uri.
#     https://watcher.sour.is/api/plain/conv/:hash         View all twts for a conversation subject.
# 
# Options:
#     uri     Filter to show a specific users twts.
#     offset  Start index for quey.
#     limit   Count of items to return (going back in time).
# 
# twt range = 1 1
# self = https://watcher.sour.is/conv/slbbjhq
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txt.sour.is
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$$\n\\left[ \\begin{array}{a} a^l_1 \\\\ ⋮ \\\\ a^l_{d_l} \\end{array}\\right]
= \\sigma(\n \\left[ \\begin{matrix}
 \tw^l_{1,1} & ⋯ & w^l_{1,d_{l-1}} \\\\
 \t⋮ & ⋱ & ⋮ \\\\
 \tw^l_{d_l,1} & ⋯ & w^l_{d_l,d_{l-1}} \\\\
 \\end{matrix}\\right] ·\n \\left[ \\begin{array}{x} a^{l-1}_1 \\\\ ⋮ \\\\ ⋮ \\\\ a^{l-1}_{d_{l-1}} \\end{array}\\right] +\n \\left[ \\begin{array}{b} b^l_1 \\\\ ⋮ \\\\ b^l_{d_l} \\end{array}\\right])\n $$=