2 robots in the mine

FCFS:

Moment 1
	wheelbarrow arrived <1 gold 2 1 [2]>
	wheelbarrow arrived <2 rubins 3 2 [6]>
	wheelbarrow arrived <3 coconuts 3 1 [3]>
	wheelbarrow arrived <4 turquoise 1 2 [2]>
		[gold        2][rubins      6]
Moment 2
		[gold        1][rubins      5]
Moment 3
	wheelbarrow arrived <5 aventurines 3 2 [6]>
	wheelbarrow arrived <6 beryls 2 1 [2]>
		[coconuts    3][rubins      4]
Moment 4
	wheelbarrow arrived <8 sapphires 4 2 [8]>
	wheelbarrow arrived <9 emeralds 1 1 [1]>
	wheelbarrow arrived <10 opals 4 3 [12]>
	wheelbarrow arrived <11 gold 1 1 [1]>
	wheelbarrow arrived <12 amethysts 3 4 [12]>
		[coconuts    2][rubins      3]
Moment 5
		[coconuts    1][rubins      2]
Moment 6
	wheelbarrow arrived <13 topazes 2 1 [2]>
	wheelbarrow arrived <14 pearls 3 4 [12]>
	wheelbarrow arrived <15 gold 2 1 [2]>
	wheelbarrow arrived <16 aquamarines 2 1 [2]>
		[turquoise   2][rubins      1]
Moment 7
		[turquoise   1][aventurines  6]
Moment 8
		[beryls      2][aventurines  5]
Moment 9
		[beryls      1][aventurines  4]
Moment 10
		[sapphires   8][aventurines  3]
Moment 11
		[sapphires   7][aventurines  2]
Moment 12
		[sapphires   6][aventurines  1]
Moment 13
		[sapphires   5][emeralds    1]
Moment 14
		[sapphires   4][opals      12]
Moment 15
		[sapphires   3][opals      11]
Moment 16
		[sapphires   2][opals      10]
Moment 17
		[sapphires   1][opals       9]
Moment 18
		[gold        1][opals       8]
Moment 19
		[amethysts  12][opals       7]
Moment 20
		[amethysts  11][opals       6]
Moment 21
		[amethysts  10][opals       5]
Moment 22
		[amethysts   9][opals       4]
Moment 23
		[amethysts   8][opals       3]
Moment 24
		[amethysts   7][opals       2]
Moment 25
		[amethysts   6][opals       1]
Moment 26
		[amethysts   5][topazes     2]
Moment 27
		[amethysts   4][topazes     1]
Moment 28
		[amethysts   3][pearls     12]
Moment 29
		[amethysts   2][pearls     11]
Moment 30
		[amethysts   1][pearls     10]
Moment 31
		[gold        2][pearls      9]
Moment 32
		[gold        1][pearls      8]
Moment 33
		[aquamarines  2][pearls      7]
Moment 34
		[aquamarines  1][pearls      6]
Moment 35
		[             ][pearls      5]
Moment 36
		[             ][pearls      4]
Moment 37
		[             ][pearls      3]
Moment 38
		[             ][pearls      2]
Moment 39
		[             ][pearls      1]
OK